jimh425 wrote:
Kayteg1 wrote:
So where is the fuel saving coming from? Thin air?
We've probably beat this one to death ...
You are assuming that the vehicles compared would be able to do the same speed with the same RPM. That's ok, but means that you also have to agree that 3.73s don't have any advantage in mpg over 4.30s in the level ground case.
We've beaten that to death, but it is still not going far.
As I wrote in comparison between my 2 trucks, the one with lower numerical gearing was giving me abut 30 percent better mpg as it was still was able to pull 18,000 lb on overdrive. (not perfectly comparable trucks, so there is margin for error)
The only technical advantage of 4.30 gearing is starting with heavy trailer on 25 percent grade. The rest is just sacrificing fuel consumption for slightly more convenience of taking big grades without downshifting.
Would you have clear disclosure like
"by few downshiftings you do on the truck with different gearing you are saving $50 each time you refuel"
would you still buy it?
