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For myself I use:
RPM - MPH
MPG - TPS
With my 4-spd auto trans I tend to keep the TPS <= 20 or 25 depending on how much traffic is behind me and on the highway I've found that my '97 Cavalier gets the following mpg's.
Without A/C: TPS of 10-12 will hold a steady speed on the flats and at 60mph I can usually average between 45mpg - 50mpg.
With A/C: TPS of 15-18 will hold a steady speed on the flats and at 60mph I can usually average between 31mpg - 35mpg.
Jeff
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