Horsepower is a measure of work done over time. Torque is a measure of turning force. An engine will maintain max vehicle speed at its horsepower peak, where it's doing the most work per unit of time. It will accelerate the hardest at its torque peak, where it's turning the driveshafts the hardest.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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