Mile Per Gallon - C4 vs C5
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Instructor
Joined: Jun 2008
Posts: 219
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From: Avon Indiana
Mile Per Gallon - C4 vs C5
There must be hard data somewhere but I haven't had time to hunt for it. Therefore, does anyone know how the C4's and the C5's compare as far as fuel efficiency?
Le Mans Master
Joined: Apr 2001
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From: Black Forest CO
I don't know about city mileage but a C4 can get highway mileage that is every bit as good as a C5. I drove my dad's 93 6-speed from California to Colorado and the mileage ranged from upper 20s to low 30s.
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I had four C4s and two C5s and I always seemed to get slightly better MPG from the C5s. But they were very close.
Racer
Joined: May 2007
Posts: 368
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From: Sask.,
We just returned from a vacation from Minot N.D to Ontario Canada and back. With my 2002 z06 i averaged from 27.9 to 31.4 miles per gallon. But not so good driving in Cities at 18 miles per gallon. My friend has a 1991 C4, he said that his car gets 25 to 29 miles per gallon.
Racer
Joined: Jul 2007
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From: St. Louis MO
C4 vs C5
Because of my profession I have lived in a few cities, so I am always on the road................my C4 which I drove daily for for five years at 188,000 miles mostly on the road I would get on an average 23-24 mpg my average speed.....75-85. I usually get about 27-29 in the C5, at the same or slightly higher speeds............my two cents............
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My old ZR-1 would get around 28-29mpg on the highway,my C5 can break into the low 30's doing the same.
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Melting Slicks
Joined: Mar 2005
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From: Mayfield kentucky
I have three vettes a 92, 97, 98, heres what I get with each of them.
92 C4 auto trans 26-27 mpg stock.
97 C5 before mods with a auto trans 28-29 mpg after mods I still get 22-23 mpg. Thats with 521 rwhp.
98 C5 6sp trans 31-32 mpg stock.
92 C4 auto trans 26-27 mpg stock.
97 C5 before mods with a auto trans 28-29 mpg after mods I still get 22-23 mpg. Thats with 521 rwhp.
98 C5 6sp trans 31-32 mpg stock.
Race Director
Joined: Dec 2003
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From: Texas
Back when I had my C4s I was less concerned with MPG but the average on the 1991 auto was around 27. I could cruise 53 MPH and get the instant to read 36 though 
The C5 is supercharged and a 6 speed, usually averaging 90% what the DIC shows (bigger injectors, I guess). Straight highway I get about 28 true MPG (DIC show about 31) and mixed I average 23-24.
The C5 is supercharged and a 6 speed, usually averaging 90% what the DIC shows (bigger injectors, I guess). Straight highway I get about 28 true MPG (DIC show about 31) and mixed I average 23-24.
Burning Brakes
Joined: Sep 2004
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From: Franklin North Carolina
St. Jude Donor '09
Driving my dad's 92 auto convert today and I am getting around 20mpg in semi around town driving. Compared to the 22 I was getting doing the same driving in my 01 Z06. My dad's 86 seems to get a little better mileage though I think the 92 is running rich. On the road however the 92 doesn't improve that much and I get 30 out of my 01 Z06.
Race Director
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From: Color my life with the chaos of trouble.
I just made a ~600 mile round trip this weekend with speeds mostly in the 70-80 m.p.h range in my 02Z. It is mostly stock (Vararam, Corsa Ti exhaust, and a tune). I averaged 28.4 including taking a couple of friends who hadn't seen the car for "spirited" rides. My 87 was an auto so it isn't completely comparable, but it was never quite that good.
Instructor
Joined: Oct 2007
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From: Western Neu Yawk
The best I ever did in my 6 speed C4 was 29.5, highway, 70mph, top down.
The best, so far in my auto C5, top UP, A/C ON, is 34.9.
These are REAL numbers, no bs and no coasting.
hth someone,
Jim
The best, so far in my auto C5, top UP, A/C ON, is 34.9.
These are REAL numbers, no bs and no coasting.
hth someone,
Jim
