Quote:
Originally Posted by bollybib
When I got mine to the driver stage in August 2011, I started keeping detailed fuel usage records. As of today, I've gone 6877.3 miles and used 652.1 gallons which averages out to 10.5 mpg. I've gotten as much as 13.5 mpg and as little as 8.5 mpg during that period.
Using Southern California regular gas, the cost averaged out to $4.087 per gallon over the same period which means I spent $2,665.00 on gas !
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I don't have my log in front of me but I too keep VERY detailed records of fuel consumption. My numbers are similar. My very best ever was 13.5 when I went about 100 miles, unloaded, with a tail wind. I had a 3-speed manual, 350, 2bbl carb at the time. 3.73 gears, stock height (28.5" or so) tires. Single exhaust.
Now the same 3.73 gears are propelled by a 383 with a 4bbl Edelbrock 1406 through a th350. Dual exhaust. Not much has changed other than I never see 13.5 any more which is probably due to the slip in the th350.
A funny note on the th350. When I went with a turbo 350 verses a 700r4 I calculated fuel prices UP TO $1.799/gallon. I figured the higher cost of the 700r4 wasn't worth it because I'm usually pulling a boat (wouldn't use OD then) and don't drive it much where I'd really need it (70mph on the slab). Back then I never imagined $4 gas.
FWIW, I'm highly skeptical of anybody claiming anything over about 15mpg. Maybe 17 mpg with a 2wd and highway friendly rear end gears or an OD tranny.
If your speedometer doesn't match a GPS, your numbers are worthless and should be noted in your mpg guess.