Cleeman99

alright what kindaMPG do u guys get with a 650CFM carb and then u guys with the 750CFM what r u guys getting MPG

HACKGT350

im running a 600cfm vacuum secondaries and im getting about 14mpg and 27 on the high way

Cleeman99

nice what kinda power u makin

HACKGT350

not sure really ran a 15.1 with the ebrake on half way and a bunch going wrong with the car should be in the low 14s high 13s in march

Cleeman99

sweet any1 else

Cleeman99

bump

hellas85stang

15 highway about and 10 in town with a 650 and 12 highway and 8 intown on a 750 but i run a 600 on my car unless i race it...

ih8chevy

i would just like to say that even for your 351 that u plan to build a 750 carb would still be a little big, a 700 is probably the biggest you should go. if you consider i run a 750 on a 390 fe big block.

Cleeman99

ya im just trying to figure out what im going to do

tinman

If gas mileage is of any concern, don't even use a carb, stay EFI.
It's also a fact of life that as more power is produced, more fuel needs to be used. The amount of fuel used in units will be referred as BSFC (if I remember right) on a complete dyno test chart.
Take a look at one someplace for a 300HP engine and then compare that BSFC to one for a 400HP engine you'll see what I mean.......