rv gas mileage

jplante4 wrote:

wa8yxm wrote:
Major differnce is the Triton, being a Ford, is a HIGH REV engine, producing the best power curve at a much higher RPM than the low-rev GM Vortec.

This may affect engine life,. but not so much MPG.

Physics says this isn't so. A higher RPM should burn more fuel. 460 cu in of air/fuel mixture going through the motor for every RPM, 15:1 air to fuel mixture indicates that higher RPM engines will use more fuel.

I had to explain this to a co-worker who bought her first car with a manual transmission. Her father told her to keep the revs high as possible. I explained that a lower RPM is fine. When she took mt advise, she commented that she was using less gas.

It's only going to burn more fuel at the higher rpm *when it needs the extra power*. What about the rest of the time.... You also ignore the displacement of the Ford being a fair bit less and I believe it has a higher volumetric efficiency. These are complex calculations, there would be more to consider but the poster who said "neither" is close to the real world answer as they both have to do 5he same amount of work and it's enough that both use a lot of gas.