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On the street, 38 mph seems to hook into a gear and get you down to around 1500rpm, giving upper 30s for MPG.

For highway, I did the same and saw that at 55mph the car hooks into a lower RPM of 2000, so I thought that would be a good MPG setting, although kinda pisses everyone off around me.

However, here's the math.

55mph at 2000rpm

Multiply by 1.25 and you get 68.75mph at 2500rpm (55*1.25 @ 2000*1.25)... and guess what? The Focus goes at least 68.75 at 2500rpm. So, same MPG as at 55.

Multiply original by 1.5 and you get 82.5 at 3000rpm... and guess what again? The Focus goes at least 82.5 at 3000rpm.

Conclusion: MPG at 55, 70, 80.... all the same. Transmission not losing projected mph at higher RPMs... at least up to 82.5.

Agree?