if i keep my foot out of it over 70 mph 
What mpg does you C3 get?
Drifting
Joined: May 2005
Posts: 1,909
Likes: 6
From: Lake Arrowhead - Georgia > 72 Base Coupe & 74 BB Roadster
I don't know- I have to shut it off at the gas pump just to catch up. I'f I leave it running I can't seem to get the tank full.
Not really. And I'm running 110 octane gas at $6.00 a gallon. 12.5:1 compression just dosen't like pump gas of any flavor.
But it do smell good!!
Safety Car
Joined: May 2005
Posts: 4,176
Likes: 7
From: Jennings LA
Dang. I need to figure out what to do. Like I said, I just got it and have gone over the engine with my buddy who has owned Corvettes his whole life.
The engine/filters/carb are all clean, and that is the mpg without the AC on. Of course, my foot is always hard on the accelerator, but it still seems low. What's the most common fix for this? (besides less acceleration)
The engine/filters/carb are all clean, and that is the mpg without the AC on. Of course, my foot is always hard on the accelerator, but it still seems low. What's the most common fix for this? (besides less acceleration)
Le Mans Master
Joined: May 1999
Posts: 6,692
Likes: 29
From: Texas
I was getting 17+ in my 82. 2.89 rear end but I drive it hard.
Now that I have a 3.55, getting 10! I need to get over how much faster the 3.55 and stay off the pedal!
But am at 6.7 0 - 60 as opposed to stock 8 or so.
Now that I have a 3.55, getting 10! I need to get over how much faster the 3.55 and stay off the pedal!
But am at 6.7 0 - 60 as opposed to stock 8 or so.
Burning Brakes
Joined: Sep 2005
Posts: 832
Likes: 0
From: Sarasota Florida
Safety Car
Joined: Nov 2005
Posts: 3,961
Likes: 573
From: Lompoc, CA. Santa Barbara County
If your only getting 9mpg, there is something wrong. Don't adapt the attitude that you don't care about gas mileage. If your water temp is too high, or your oil pressure is too low, or your gas mileage is way lower than expected, something is wrong. Fix it before you really hurt your engine. My stock L-82 with 3.55 gears would get at least 12mpg when it was stock. When it dropped significantly, the cat converter was clogged or the Q-jet rods were bent. I bet that test pipe will make a big difference in gas mileage and horsepower. Also, make sure the valve in the right exhuast manifold is opening. Does the car accelerate decently. Can you leave a four cylinder Honda in the dust? Do Mustang 5.0s leave you? You've come to the right place. Keep testing. We will convince you eventually that you need 2 1/2" Flowmaster duals, 700R4 tranny, Performer RPM intake manifold, and titanium brakes in no time. And when nothing else can be done, we will convince you to do a frame off restoration. Your gonna be rich with all the money we are going to save you.
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Safety Car
Joined: Dec 2005
Posts: 4,270
Likes: 20
From: Central Michigan
Never actually checked it....
On the freeway it seems alright(judging by how far the gas gauge has moved over a certain distance), but driving in traffic is where the mileage really takes a beating
On the freeway it seems alright(judging by how far the gas gauge has moved over a certain distance), but driving in traffic is where the mileage really takes a beating
Le Mans Master
Joined: Feb 2001
Posts: 6,317
Likes: 292
From: Ocala FL
My '79 L48 auto got about 10-11 mpg. 10 mostly around town, 11.5 on highway.
My '68 was only checked a couple of times. Once going to an autocross 100 miles away with some guys, one of which pulled the tag off his Monte Carlo to put on his '56 to drive there. So we drove 55 and not a mile over to avoid getting stopped. Unfortuantely, I autocrossed and then checked mileage when I filled up for the trip home.
'68 427/390 hp, 4 sp, 3.08 rear. 19 mpg.
One trip back from Bloomington, belts had gone bad and I lost one, and had the others slipping. Only running 50 home, as any faster made the belts slip.
'68 427/390 hp, 4 sp, 3.55 rear. 15 mpg.
'77 L48 auto same trip 12 mpg
'72 350 auto same trip 13 mpg
Stinkin' junk '68s.
Even with more horses and lower gears, I got better economy than those later C3s.
My '68 was only checked a couple of times. Once going to an autocross 100 miles away with some guys, one of which pulled the tag off his Monte Carlo to put on his '56 to drive there. So we drove 55 and not a mile over to avoid getting stopped. Unfortuantely, I autocrossed and then checked mileage when I filled up for the trip home.
'68 427/390 hp, 4 sp, 3.08 rear. 19 mpg.
One trip back from Bloomington, belts had gone bad and I lost one, and had the others slipping. Only running 50 home, as any faster made the belts slip.
'68 427/390 hp, 4 sp, 3.55 rear. 15 mpg.
'77 L48 auto same trip 12 mpg
'72 350 auto same trip 13 mpg
Stinkin' junk '68s.
Even with more horses and lower gears, I got better economy than those later C3s.
Safety Car
Joined: Nov 2005
Posts: 3,961
Likes: 573
From: Lompoc, CA. Santa Barbara County
Thanks in advance.
Last edited by Bee Jay; Jan 26, 2007 at 10:01 AM.
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