Answers: merely fill container up, write down your mileage, then drive it for awhile, when you cram it up, write mileage; figure out mile driven; later figure out how plentiful miles driven. ie 100 miles driven / 10 gal. used = 10mpg 100/10=10
If it is a stock 350 with a 4 cask carb and around 120k miles then i would estimate give or take a few 9-14 city and 13-16 highway..in other words not worthy,if its a 305 slightly better but less power and if its get a bigger carb even less,you can buy different jet thou and tweak it to get you probably 15 average,my Chevy 350 get 18 on a 750 cfm carb with dual pipes but i enjoy alot done to it...good luck near the way gas prices are
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