MPG what do you get - Forums - Official C3 Vette Registry

SPONSOR AD

Support our Vendors! | Advertise Here

Topic: MPG what do you get

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

Already a Member?
Login
Not yet a Member?
Register for Free!

MPG what do you get (1/29)
7/19/11 12:37pm

tb2k82ce

Lifetime Member
Send Private Message

Lemon Grove, CA - USA

Vette(s):
1982 C3 Collectors Edition 44000 miles, sat in the sun most of its life, My wife purchased it for me for Father's Day in 2007 from her girlfriend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.

Joined: 10/17/2007
Posts: 2041

I'm hoping that the mileage I'm getting on my stock 82 is not normal and I can fix it. First I need to know what is normal. I would bet there are others that would like to know this also and I know that it was done years ago. Did they post mileage on cars when C3's were new? I do not think so but if so does anyone have that data?

If you please could we have what you are running and if it is not basically stock what you have done that could affect mileage, what the car is, freeway-open road mileage, Mostly in town mileage, 50/50 Normal mixture of in town and road.

Corvette configuration: 82 stock auto transmission
Mileage Freeway: 12 mpg Angry

Mileage in town: unknown
Mileage 50/50: 11mpg Cry

Our Sponsors help support C3VR

MPG what do you get (2/29)
7/19/11 12:56pm

Gunslinger
Former Member
Send Private Message

Frederick, MD - USA

Vette(s):
1969 convertible L71 427/435 4-speed black interior

Joined: 9/8/2003
Posts: 3398

I have a '69 427/435...3 carburetors, M21 transmission, L88 camshaft, 4.11 rear axle.

Mileage? 6mpg...doesn't matter whether I drive it highway or around town, fast or slow...the mileage doesn't change. I get roughly 125-150 miles to a tank of gasoline.

Smiles per mile? Off the chart!

MPG what do you get (3/29)
7/19/11 1:09pm

manchestershark

Lifetime Member
Send Private Message

Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 2465

Basic stock 350. M-20 3.36 rear. The trip to Effingham bout 12-13. Did an adjustment on carb on the road, then got 18-19 rest of trip. Home on the hills, bout 15-16.

______________

Click on image for full view

MPG what do you get (4/29)
7/19/11 1:17pm

Jaws79

Lifetime Member
Send Private Message

Sykesville, MD - USA

Vette(s):
1979 Corvette Coupe Corvette Light Blue Midnight Blue interior Mirrored Glass T-tops

Joined: 4/27/2008
Posts: 4239

Have never done much around town driving to check it, but my basically stock 79 L48 with the 3.55 rear gets about 14 mpg on the highway. It's good to have a 25 gal. tank, though! Thumbs Up

Barry

______________
"Down on the Boardwalk...

(Click image to see a larger version}

Lifetime Member #181

MPG what do you get (5/29)
7/19/11 2:51pm

kwoody
Former Member
Send Private Message

Tucson, AZ - USA

Vette(s):
1982 Black/Tan Leather Build Code C09E Bronze TTop CrossFire Fuel Injection L83 85 Fuel Pump Auto Axle 2.72 Firestone Firehawk Indy500

Joined: 7/11/2010
Posts: 415

Hi Gilbert,

I got 18.5 MPG on the last road trip (220 miles or so) at 70-75 MPH. That is before the new plugs. The next tank will give me mostly around town numbers. Update: Around town the next tank gave me 16.25 MPG. Around town is really 65 MPH for 25-30% of the time and Stop and go fast for the rest..... I found the timing was set for 12* and I just reset it to 10*. It runs a bit hotter now but, seems smoother getting to 40-50 MPH.

82 CFI only mod is a 85 higher pressure/flow fuel pump. 59,000 miles

This is my original EPA sticker info: Click link for larger version.
http://209.200.117.236/member_uploads/14401_14500/14492/82CFI_EPA_STICKER.jpg

kwoody2011-07-24 08:20:47

______________

Nobody ever waves when I'm driving the Explorer.
K Woody

MPG what do you get (6/29)
7/19/11 3:07pm

ebo

Lifetime Member
Send Private Message

Holland Patent, NY - USA

Vette(s):
#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4421

[QUOTE=kwoody]

[/QUOTE]

$1.65 a gallon wow was gas ever that cheap? Actually I remember haveing to pay .45 cents for a gallon of gas for my mini bike, and no it did not have wooden wheels. LOL

Effiningham trip was all over the place 15, 18, and the best was 21mpg just after I put the new coil in Confused

ebo

______________

Click on image for larger view!
LIFETIME MEMBER 151

ebo

MPG what do you get (7/29)
7/19/11 4:23pm

Iron82

Lifetime Member
Send Private Message

Vette(s):
1982 Collector Edition #3413

Joined: 7/24/2003
Posts: 2150

My 82' CE is stock and numbers matching. This is with my driving techniques.

Town is stop and fast take off 13mpg and stop and slow take off 16mpg.

Highway mileage is 70mph steady with cruise on/off 26mpg, 75mph steady with cruise on/off 24mpg. At times I tend to play on the highway... Tongue

so it varies. I have gone 400 miles without stoping for gas and that's when my low fuel light (2 gals left) came on. Clap

Hope this helps your problem.

MPG what do you get (8/29)
7/19/11 5:47pm

manget1

Lifetime Member
Send Private Message

Indianapolis, IN - USA

Vette(s):
Silver 1974 Convertible - L82 4 speed Low miles (was only 8,900 when I bought it in March 2006) - Now 54K miles. Original owner bought it as an investment for son's college expenses. 2008 Jetstream Blue Convertible

Joined: 9/3/2006
Posts: 2428

14-16 is an average on my 74 L-82 4 speed. I stick around 70 on the highway on trips

______________

I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!

��

target=_blank>Click for another pic!�� And yet another!

MPG what do you get (9/29)
7/19/11 7:19pm

dwright
Former Member
Moderator
Send Private Message

Victor, NY - USA

Vette(s):
2004 Commemorative Edition Coupe, Auto w/HUD. 13K miles in 2015. Sold 1982 Red Coupe

Joined: 7/12/2004
Posts: 6841

Stock '82.

Cruising at 65 mph- 25+

Cruising at 75 mph- 20-22

Stop and go, easy on the pedal- 19-21

Driving the Tail of the Dragon- 12, but loved every foot of it.

With the AC on it drops a little.

______________

Save the Wave!
Support the National Corvette Museum

MPG what do you get (10/29)
7/20/11 12:07am

DaveM

Lifetime Member
Send Private Message

Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2553

When I had the stock Cross-fire I got about 25 highway, around 70 mph. Around town I got about 17. With the new ZZ4 engine, 3.55 rear, I get about 20-21 highway and about 15-16 around town.

Your's is way off the mark. Hope you find whats causing the low mileage.

Dave

______________

Lifetime Member #116
Dave's '82

MPG what do you get (11/29)
7/20/11 4:04am

crossfire1982
Former Member
Send Private Message

Cramerton, NC - USA

Vette(s):
black 1982 coupe slate gray interior, 350 crossfire, 1985 fuel pump, Steeroids R&P conversion

Joined: 8/22/2006
Posts: 1094

Ive never driven mine on an extended road trip (perhaps the next C3VR gathering Tongue

) but around town Im getting between 17 and 18mpg. Stock crossfire except running 85 fuel pump with a regulated pressure of 14.5 psi.

MPG what do you get (12/29)
7/20/11 5:20am

manchestershark

GREAT post. Sounds like our numbers are pretty consistant. I have been wondering how I compared to the other drivers. THANKS for putting it up.

______________

Click on image for full view

MPG what do you get (13/29)
7/20/11 8:35am

tb2k82ce

When we get some more I will put them all in a list so it will be easy to digest. Then I'm going to be asking for ideas on why mine is so bad. But that is another post question.

Thanks for all of the inputs so far. I know there are others out there for other years just send them in and I will put them together. When this falls off the 24 hour list.

MPG what do you get (14/29)
7/20/11 9:13am

Adam Wartell

Lifetime Member
C3VR Founder
Send Private Message

Eagleville, PA - USA

Vette(s):
Used to own a 1979 Corvette now owned by JB79

Joined: 11/1/2001
Posts: 18303

For those of you with smartphones, check out an app called "FuelLog."

At each fill up you just plug in a few pieces of info and it will start calculating your MPG along with a bunch of other stats. I know it is available for Android, not sure about iOS.

______________

-Adam Wartell
NCM Lifetime Member #1222
Founder: C3 Vette Registry
C4 Vette Registry, C6 Vette Registry

My first Vette, now owned by JB79:

MPG what do you get (15/29)
7/20/11 9:28am

ebo

[QUOTE=Adam Wartell]For those of you with smartphones, check out an app called "FuelLog."

At each fill up you just plug in a few pieces of info and it will start calculating your MPG along with a bunch of other stats. I know it is available for Android, not sure about iOS.

[/QUOTE]

I'm thinking out of all the people here you are getting the best Vette gas mileage Shocked

ebo

______________

Click on image for larger view!
LIFETIME MEMBER 151

ebo

MPG what do you get (16/29)
7/20/11 10:07am

Adams' Apple

Lifetime Member
Moderator
Send Private Message

Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20201

The '74 gets around 16 if I treat it nice on the road...which I usually do NOT. 70-75mph anywhere I'm headed...end of story. So...my real mileage is closer to 12-14mpg.
The '85 will cruise all day with the A/C blasting, 70-75mph, and get 25-26 mpg.

______________

Joel Adams
C3VR Lifetime Member #56
My Link

(click for Texas-sized view!) NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

MPG what do you get (17/29)
7/20/11 10:43am

rod7515

Lifetime Member
Send Private Message

Red Lion, PA - USA

Vette(s):
1974 White 350 Corvette, TH400 Automatic 1972 Tangerine /Go Mango Convertible 383 Stroker, 2004r Automatic

Joined: 10/27/2006
Posts: 1182

Ive only checked mine one time and that was last fall. I was happy as can be when I found I was getting just over 19. I checked it twice during that trip just to make sure. I still have trouble believing it. 350 bored .030 with small cam, edelbrock 2101 intake, Summit heads, Factory quadrajet, Headers, 400 turbo trans with 308 gears.
Rodney

______________

MPG what do you get (18/29)
7/20/11 3:02pm

Adams' Apple

[QUOTE=rod7515] ...with 3.08 gears. [/QUOTE]

And there you have it!

______________

MPG what do you get (19/29)
7/20/11 3:28pm

TargaBlue72

Lifetime Member
Send Private Message

Lodi, WI - USA

Vette(s):
1972 Targa Blue, T-Top, Saddle leather, 350 auto,numbers match, all original except '69 factory side exhaust. Previously owned: 1969 427, 390hp, 4sp, Riverside Gold coupe, factory side exhaust

Joined: 9/25/2007
Posts: 340

My 72 stock 350 with TH 400 auto always got about 15 HWY and considerably less in town.
A few years ago I installed a HEI distributor and upgraded plugs and plug wires.
On the 900 + mile trip to Effingham last May, I averaged a little over 17. I was really surprised. Smile

Didn't think it would make that much difference.

Dean

______________

click on either image for larger view

MPG what do you get (20/29)
7/20/11 4:52pm

hmel '74
Former Member
Send Private Message

York, SC - USA

Vette(s):
1974 mille miglia red with oxblood interior 355ci, 320hp

Joined: 9/4/2005
Posts: 534

[QUOTE=dwright]Stock '82.

Cruising at 65 mph- 25+

Cruising at 75 mph- 20-22

Stop and go, easy on the pedal- 19-21

Driving the Tail of the Dragon- 12, but loved every foot of it.

With the AC on it drops a little.

[/QUOTE]
have I told you lately that I hate you, Dave? Wink

______________

MPG what do you get (21/29)
7/20/11 6:46pm

Jeff,

If you want better gas milage, change the axle ratio to 2.78 and put in an overdrive.

Then you will have a dog like mine. LOL

______________

Save the Wave!
Support the National Corvette Museum

MPG what do you get (22/29)
7/20/11 8:49pm

Bobbi's78

Lifetime Member
Send Private Message

Coatesville, PA - USA

Vette(s):
1978 Silver Anniversary Paint w/Mahogany Interior

Joined: 3/17/2007
Posts: 368

Since putting the 700R4 in, we run anywhere from 19 to 27 mpg (Effingham trip) depending on how "bad we treat her", as Joel said. 55 mph on the highway yielded best results. Before the 700R4...15-16

______________

LIFETIME MEMBER # 191

MPG what do you get (23/29)
7/21/11 5:30am

DaveM

Hey Barb, don't you just love that first gear! Big smile

Dave

______________

Lifetime Member #116
Dave's '82

MPG what do you get (24/29)
7/22/11 9:33pm

Davefromarizona

Lifetime Member
Send Private Message

Phoenix, AZ - USA

Vette(s):
1975 Stingray Nomad Wagon, with Daytona front, custom hood scoop, dual side vents; 420HP 350; Doug Nash 5 speed; 1980 rear end W/4:11 gears; Cherry Red metallic paint.

Joined: 3/13/2004
Posts: 537

exactly the same as my 74 4 speed, just ran with it last week and was happy with 15mpg @ 70-75. Smile

______________

Lifetime Member #36

click on any image for a larger view

MPG what do you get (25/29)
7/23/11 10:21pm

RADARB8

Lifetime Member
Send Private Message

Montesano, WA - USA

Vette(s):
had a really nice one. sold it to a good friend. Purchased 2004 custom coupe in Feb. 2009 did not tell anyone here until August 2009. BAD I KNOW.

Joined: 9/27/2003
Posts: 1931

45 to 60 it's a hybrd. sorry i just had too i will leave now

MPG what do you get (26/29)
7/24/11 6:50am

lukesvette

Lifetime Member
Send Private Message

HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6812

[QUOTE=DaveM]Hey Barb, don't you just love that first gear! Big smile

Dave

[/QUOTE]

Davey, I love my first gear but the BFG TAs just haaaate it!! Evil Smile

Believe it or not, with the 700R4 in OD mode, the Lukester gets anywhere from 16-18 HWY. Thumbs Up

On local roads, its GPM, not MPG!! Clown

______________

LukesVette Homepage
Veteran of Operation Iraqi Freedom
101st Airborne(AirAssault!)
God Bless America
Support Our Troops

MPG what do you get (27/29)
7/24/11 10:37pm

TommySSE
Former Member
Send Private Message

Darnestown, MD - USA

Vette(s):
"Ruby", is my 1982 Candy Red - my Daily Driver

Joined: 1/1/2009
Posts: 32

"Ruby" is my daily driver, and after the ignition upgrade, running on regular gasoline (87) I've had a chance to run several tanks of gasoline and she is giving me an average of 18 miles to the gallon. City and highway mix 50-50. I can't wait to take a long trip and find out what she'll do on a highway cruise.

TommySSE2011-07-24 22:38:45

______________

Tommy
1980 Project Corvette - (Need suggestions)
1982 "Ruby" (Ain't She Sweet!)

MPG what do you get (28/29)
7/25/11 6:22pm

Sarge81

Lifetime Member
Send Private Message

WEST SENECA, NY - USA

Vette(s):
1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.

Joined: 12/3/2001
Posts: 2379

On the last trip to Effingham I managed almost 23 mpg @ 70 mph. I had to go this slow due to a nasty vibration. I love my Tremec 5 speed.

______________

GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.

3.54 Dana 44

'69 "N11" Sidepipes
Borgeson Steering Box
Born 8/1981
Sequence #3975

Click here to see more pics of my Vette on CarDomain.

Lifetime Member #26

Re: MPG what do you get (29/29)
12/4/11 4:18pm

sfindlan
Former Member
Send Private Message

Badin Lake, NC - USA

Vette(s):
1979 Red L-48 Corvette with Doeskin interior, 3-speed automatic, 3.55 rear; 1986 L-98 Coupe, 4+3 Manual - Satin Black and Purple (SCCA TT/Hillclimb Car); 1993 White LT-1 Coupe, Black Interior, 6-speed

Joined: 4/21/2004
Posts: 101

79 L-48 with 3.55 gears and 350THM auto:

Average of about 14 mpg with the former Rochester Carb. Just upgraded with a GM performance parts manifold and Holley 4160 carb. New dual exhaust (nice chambered dueal kit from Midamerica). Much better throttle response, much stronger acceleration off the line - about the same at upper RPM. Gas guage seems to drop off a little slower, but hard to really tell as I seem to be on it frequently so I can enjoy the really crisp exhaust note.

Guess it will be awhile before I drive it to maximize mileage....I am guessing sometime around the year 2035. Dead

In the end, we didn't buy these things for their outstanding economy. Smile

______________
C3: 1979 Corvette Coupe, Auto, L-48, Red/Doeskin (my wife's fave);

C4s: 1986 C4 coupe (SCCA road race car), satin black, 4+3, Z51 package, L-98; & 1993 C4 coupe, white, 6-speed, LT-1.

http://www.C3VR.com/member_uploads/6001_6100/6032/P102018120111222163715r.jpg

https://www.c4vetteregistry.com/member_uploads/14301_14400/14327/WolfRidge-Dusk-by-GRM20111222173029r.jpg

Our Sponsors help support C3VR