[graydonengineering]

I have found (with the help of my ultragauge) is that I must keep my RPM super low. I go ahead and rev it up to get up to speed like the average driver but once I am up to speed, i pick the highers gear that doesn't lug the engine. Before i figured that out, i would go 40 in 3rd gear and my instant mpg in that case is only about 25 mpg. In 5th, I can hit about 35 mpg. If I am going up hill, i have to go with 4th gear.

The 5 speed on my truck is too low to pull good mpg at over 65 mph and most older trucks rev high at even lower speed. I am planning on buying taller tires next time around to up my gearing.