How many MPG does your C3 get?
#1
Pro
Thread Starter
How many MPG does your C3 get?
Hi I have a 1976 corvette that seems when I step in it, it is always a half tank or lower. I was wondering how many miles per gallon does your c-3 corvettes.
Thanks,
Kevin
Thanks,
Kevin
#3
Race Director
My previous 550HP 406ci got 24mpg on the highway at 80mph, with TKO 600 in .64 overdrive.
I also tuned the carb correctly with a LM-1 wideband, if you get crappy gas mileage get your carb tuned right
I also tuned the carb correctly with a LM-1 wideband, if you get crappy gas mileage get your carb tuned right
#5
Race Director
What most don't realize is they have no idea if there carb is tuned correctly. You need to "see" what is going on. To do that you need a wideband O2 sensor like the LM-1. Going from a real badly tuned carb to a properly tuned carb you can double if not triple your gas mileage. I am not kidding here either.
When I got my 406ci back from the dyno shop the mileage was so bad I thought I had a hole in my gas tank. I am not joking, I checked several times for leaks. I re-jetted and the mileage was much better. This was before I bought the wideband. After I got that I tuned the carb perfect for idle, cruise and WOT
When I got my 406ci back from the dyno shop the mileage was so bad I thought I had a hole in my gas tank. I am not joking, I checked several times for leaks. I re-jetted and the mileage was much better. This was before I bought the wideband. After I got that I tuned the carb perfect for idle, cruise and WOT
#6
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#12
Team Owner
TPIS ZZ9 cam L98 heads on a roller 355, 200 4r auto, 336 rear....22.2222 mpg at 90 mph.....cruise....
in town not so great,.....
but with the stock L48 and carb it got only 12-14 mpg.....
but that was 16 years ago...
just the injection about doubled that even with the munice and same gear set.....
so the newer/modern engine added about 150 hp, and then so the MPG went to hell right there....even with the overdrive....
in town not so great,.....
but with the stock L48 and carb it got only 12-14 mpg.....
but that was 16 years ago...
just the injection about doubled that even with the munice and same gear set.....
so the newer/modern engine added about 150 hp, and then so the MPG went to hell right there....even with the overdrive....
#13
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2023 C3 of the Year Finalist - Unmodified
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Well it's a 68 427/390 turbo 400 with a 3:08 rear end so it really isn't too bad on the highway if you stay on those puny primaries. Probably about 15-18 mpg. Around 10mpg around town.
If I'm jumping on it around town it gets nothing. It's not like I'm commuting in it though. The car is pure pleasure to put your foot into
If I'm jumping on it around town it gets nothing. It's not like I'm commuting in it though. The car is pure pleasure to put your foot into
#15
#17
70 coupe
best ever in my 70 350/300 turbo 400 with 3:08 in summer of 1975 driving from San Diego to Dallas loaded with luggage was 22 mpg interstate roads using the factory air. Today with the ZZ engine, about 17 mpg.
the 68 with no A/C and original 327/350 4-speed 3:70 gears last time I checked was 17-18 mpg on interstate. wonder what mpg would be with 3:08 gears?
the 68 with no A/C and original 327/350 4-speed 3:70 gears last time I checked was 17-18 mpg on interstate. wonder what mpg would be with 3:08 gears?
#19
Racer
With the combination listed below I get 12.42 mpg in town.
SBC 383
Forged Crank
Forged H-beam 6.00 rods
Forged pistons 10.41 compression
Late 4 bolt 1 piece rear seal block
ARP fasteners (mains & rods)
Comp Cams hydraulic roller cam XR-288-HR (236, 242 @ .050 with .520, .540 lift)
Edelbrock Performer RPM heads 64cc angle plug
Edelbrock Preformer RPM Air Gap intake
Quickfuel 830 cfm double pumper carb
MSD Streetfire HEI ignition
Headers with 2 1/2 “exhaust with Super 44 mufflers
Turbo 350 with 2500 stall converter
SBC 383
Forged Crank
Forged H-beam 6.00 rods
Forged pistons 10.41 compression
Late 4 bolt 1 piece rear seal block
ARP fasteners (mains & rods)
Comp Cams hydraulic roller cam XR-288-HR (236, 242 @ .050 with .520, .540 lift)
Edelbrock Performer RPM heads 64cc angle plug
Edelbrock Preformer RPM Air Gap intake
Quickfuel 830 cfm double pumper carb
MSD Streetfire HEI ignition
Headers with 2 1/2 “exhaust with Super 44 mufflers
Turbo 350 with 2500 stall converter