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It depends on the vehicle. If the gearing is way too low, then yes, it will typically help. However, if it's not geared all that badly to start with, then the gearing change may not overcome the aero penalty.
What do you turn as far as RPM at 60mph?
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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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