[1972BlueC20]

I get a consistent 10-11 mpg in my 72 C20 LWB with 350 v8 / TH350.

I have an Edelbrock 1406 600 CFM (this carb is supposed to be for better fuel economy)

I don't think it really matters much whether you have a v6 or v8 in these trucks.....they are rolling 40+ year old bricks! You really aren't going to get much better than around 10 mpg unless you change the transmission to an overdrive trans and put in a better rear gear....but even at that it won't be much better honestly.....with city driving at least.

It doesn't seem to matter how I drive, it's always around 10 mpg whether I drive like a granny or like a nascar driver LOL