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Old 12-10-2012, 08:58 PM   #1
Lil" Red Corvette
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Default What is your MPG?

I'm wondering what kind of MPG number others are getting out there. I've always tried to keep my car fairly economical while at the same time running decent at the track. Here are my numbers.

ZZ3, 200R4, 3.08, Q-Jet, AC off, 70MPH. 25MPG all highway
About 13.5 MPG average in the city.

After that I changed gears to 3.73 and installed the GM Hot Cam Kit and now I get 20 MPG with AC on and 21 MPG with it off highway. Still get about the same in the city.

Runs low 13s at about 105.

Last edited by Lil" Red Corvette; 12-11-2012 at 12:56 AM.
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Old 12-10-2012, 09:19 PM   #2
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Freeway driving . . .18, that's with a stock 73 L-48 auto, running 35 psi in all four tires.
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Old 12-10-2012, 09:33 PM   #3
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Quote:
Originally Posted by imariver View Post
Freeway driving . . .18, that's with a stock 73 L-48 auto, running 35 psi in all four tires.
That is what I use to get with the stock ZZ3 and Turbo 400 trans. The OD trans really boosted my highway MPG.
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Old 12-10-2012, 10:08 PM   #4
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12mpg 450 horse 383 lol.
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Old 12-10-2012, 10:19 PM   #5
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Default Mpg

454 running 344 RWHP: 15 on the highway.
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Old 12-10-2012, 10:35 PM   #6
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270 hp 4 speed 3.36. 16-18 if I keep my foot out of it.
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Old 12-10-2012, 10:40 PM   #7
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I'm guessing 12 around town with my 370 HP LT-1 engine. I have a bit of fun with it, though.

Didn't do much interstate driving...not enough to gauge mileage.

New cam will have so much overlap that I'll be able to condense my exhaust directly into the gas tank to recover some fuel. I'll probably get 5 MPG then!

Honest truth, I wasn't deciding between this and a Prius when I made my decision. Crappy mileage sort of comes with the territory.
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Old 12-10-2012, 10:49 PM   #8
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Did my first TPI install on my stock engine '72 vert here in '95....long about Feb '97 I drove it here from Wash DC, 350, muncie, 336 rear and got 24 mpg......

got a roller cam engine with tons of history and mishaps and a 200 4r overdrive, same 336 rear I figger about the same highway...

and 15 around town....but MY around town is VERY short trips, not even 2 miles one way.....retarrrded so nowhere to go.....

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Old 12-10-2012, 11:19 PM   #9
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Regarding my mileage, all I have to say is-
__________________
08 Jetstream Blue Z06 w/ Comp Grey wheels & 2LZ- and LeMans Blue 69 coupe, original 427(now 439), L88 hood, forged alum. pistons(9.5 comp), Barry Grant Holley DP, Edel. Perf. RPM Airgap intake, Edel. Perf. alum. heads, Ultradyne solid flat tappet cam(243/251 @.050,.586/.601 lift) Jet Hot coated Hedman headers, mandrel 2 1/2" exh. w/ Dynomax Ultraflos & X pipe, TH400 w/ B&M cooler, Continental 2600 RPM stall TC, 3.55 gears, QA1 adjust. shocks, MT ET Street Radials, 1/4 mile in 11.37 @ 119.7 MPH
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Old 12-10-2012, 11:24 PM   #10
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68 BB 427/390hp rebuilt to stock specs 10 mpg local.
I haven't had it on a long voyage yet so hiway mpgs may be
slightly better.
Marshal
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Old 12-10-2012, 11:35 PM   #11
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When looking to buy my '81, it wasn't miles per gallon that worried me. It was the SMILES per gallon that intrigued me.
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Old 12-11-2012, 12:11 AM   #12
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'79 383 roller cam 224 deg intake duration 700-R4 trans 3.55 gears gets me about 20 miles per US gallon on the highway if I can keep it under about 65.
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Old 12-11-2012, 12:31 AM   #13
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Not much and dont really care
When its empty I fill it back up.

Long as it sucks my head back when I stop it Im happy
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Old 12-11-2012, 12:41 AM   #14
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Quote:
Originally Posted by cuisinartvette View Post
Not much and dont really care
When its empty I fill it back up.

Long as it sucks my head back when I stop it Im happy
Try driving forward instead of backwards. The MPG is much better.
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Old 12-11-2012, 06:47 AM   #15
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Quote:
Originally Posted by kjb13 View Post
When looking to buy my '81, it wasn't miles per gallon that worried me. It was the SMILES per gallon that intrigued me.
and thumbs up!!!
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Old 12-11-2012, 09:52 AM   #16
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Default Best I ever got MPG...

Me and my 2 cents worth....78 coupe...stock 350/auto..no cat conv but running turbo muffs....15mpg highway.....cannot count parades and cruise-ins...........if so it would probably drop to 10mpg or worse.....

Am wondering if I should up the tire pressure to 35psi?????

Any comments???

Mike
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Old 12-11-2012, 10:32 AM   #17
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Lousy. 13 to 16 MPG. Small block convertible, 4 speed, 3.36 gears. Would love to put an overdrive in it. Not in the budget, yet. So I'm buying lottery tickets.
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Old 12-11-2012, 11:08 AM   #18
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Getting about 13mpg with a stock motor with headers and 2.87s out back. I know something isn't right. Sent my carb out to Lars. I'm sure I'll see some improvement in mpg after the rebuild.
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Old 12-11-2012, 12:48 PM   #19
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Stock motor on a L-48 with a 3.08 and Th350, 14 MPG before electric fans and carb rebuild. 22 MPG combined highway and town after.
Likely to be worse after new bigger cam and intake, but with bigger smiles. Fair trade.
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Old 12-11-2012, 01:17 PM   #20
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About 67mpg, downhill with the engine shut off.

With a ZZ4 in my 82 the best I have gotten is 21mpg highway and 16mpg around town.

Andy
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Old 12-11-2012, 01:17 PM
 
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