How many hwy rpm's are you turning currently. My closest example are muscle cars: GT500 and the Corvette with their big motors only turn 1600rpm to go 70mph. Most chevy LS cars are double overdrive. So 4th is 1:1, 5th is something like .86, the 6th is 0.5. So everything i've seen rpm is a heavy factor. Even the 50mpg civic CX only spins 2200rpm @ 70mph while my car with the same motor but different FD gear i'm spinning right under 3000 and barely getting 40mpg.
But yeah Ford gears are the same in just about everything so you can get 2.73 3.15. 3.33 3.55 3.73 3.90 4.10 4.30 4.56. Tons of choices lol
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