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7/20/11 9:46pm - Reply: 'MPG what do you get'
dwright Gold Member
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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: 6756
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


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7/20/11 11:49pm - Reply: 'MPG what do you get'
Bobbi's78 Lifetime Member
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Coatesville, PA - USA

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

Joined: 3/17/2007
Posts: 349
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

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7/21/11 8:30am - Reply: 'MPG what do you get'
DaveM Lifetime Member
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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: 2530
Hey Barb, don't you just love that first gear!Big smile
Dave


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Lifetime Member #116
Dave's '82


   
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7/23/11 12:33am - Reply: 'MPG what do you get'
Davefromarizona Lifetime Member
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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: 534
exactly the same as my 74 4 speed, just ran with it last week and was happy with 15mpg @ 70-75.Smile

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7/24/11 1:21am - Reply: 'MPG what do you get'
RADARB8 Lifetime Member
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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

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Okay its not a C3 but it is cool as hell.....
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7/24/11 9:50am - Reply: 'MPG what do you get'
lukesvette Lifetime Member
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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: 6804
[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


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7/25/11 1:37am - Reply: 'MPG what do you get'
TommySSE
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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.
Thumbs Up
TommySSE2011-07-24 22:38:45

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Tommy
1980 Project Corvette - (Need suggestions)
1982 "Ruby" (Ain't She Sweet!)
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7/25/11 9:22pm - Reply: 'MPG what do you get'
Sarge81 Lifetime Member
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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: 2376
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.

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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.


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12/4/11 7:18pm - Reply: 'Re: MPG what do you get'
sfindlan
Former Member
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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


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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.
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 Forums -> C3 Fuel, Emission Control, and Exhaust Systems
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