Gas Mileage

[rustyMUD]

Originally Posted by 86c20

i avg about 21ish highway at 70. and i am not a nice driver.

I've seen your claim of 21mpg in your sig for a while and will take this as an opportunity to ask you how you do it?

I have an 82 K20 with a 350, SM465 and 3.42 gearing. The average for highway driving is 13mpg and the absolute best was 15 with a strong tailwind. I drive at 55mph and stay out of the secondaries if I can help it. I've noticed that driving anything over 60 makes the mileage drop. The truck is well tuned and runs on ethanol free premium.

My truck being 4wd shouldn't account for a 7 mpg difference. Based on what others have posted I believe my mileage is average for my setup. I know plenty of people who are very pleased to get 21mpg in their brand new fullsize trucks, with better aerodynamics and overdrive.

If there is some secret to getting 20+ mpg from a carb V8 gas powered, non-overdrive truck that possesses the aerodynamics of a brick, please share.

[Rubble]

Originally Posted by rustyMUD

I've seen your claim of 21mpg in your sig for a while and will take this as an opportunity to ask you how you do it?



If there is some secret to getting 20+ mpg from a carb V8 gas powered, non-overdrive truck that possesses the aerodynamics of a brick, please share.

Ya,I'm curious about this claim as well,done a quick calculation with your specs.I am guessing tire radius around 15-16" So at 70 mph your turning around 25-2600 rpm.Even more if you have a smaller tire. An explaination would be great...