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Ziegelsteinfaust · 10-28-2020, 10:23 AM

A friend I had at my old apt block had a 5.3 swapped C10 rcsb. He said untuned he would routinely be around 24mpg highway. He had the same gear ration my truck had which was 3.23, but I had a 07 rcsb. With a 6/8 drop. I could get 21-22 cruising the highway to work. I am sure with a few tricks he could get the same at higher speeds. His engine did not have the dod.

The truck he had was a 74? with a 4/7 drop roughly with something like 255/60/15 on all 4 corners.

It was kind of weird how much more larger my truck was with out offering better interior space.

If your concerned about mpg. Gear it so the engine is hitting the torque band at the speed you intend to cruise. If your going for big wheels or heavy wheels. Shoot for 2500 or so it is firmly in its power band to drive the heavy running gear.

10-28-2020, 10:23 AM	#3
Ziegelsteinfaust Registered User Join Date: Dec 2012 Location: Temple City Posts: 3,561	Re: Mpg A friend I had at my old apt block had a 5.3 swapped C10 rcsb. He said untuned he would routinely be around 24mpg highway. He had the same gear ration my truck had which was 3.23, but I had a 07 rcsb. With a 6/8 drop. I could get 21-22 cruising the highway to work. I am sure with a few tricks he could get the same at higher speeds. His engine did not have the dod. The truck he had was a 74? with a 4/7 drop roughly with something like 255/60/15 on all 4 corners. It was kind of weird how much more larger my truck was with out offering better interior space. If your concerned about mpg. Gear it so the engine is hitting the torque band at the speed you intend to cruise. If your going for big wheels or heavy wheels. Shoot for 2500 or so it is firmly in its power band to drive the heavy running gear.