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Old 01-10-2018, 08:29 PM   #8 (permalink)
oldtamiyaphile
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Join Date: May 2009
Location: Australia
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UFI - '12 Fiat 500 Twinair
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90 day: 40.3 mpg (US)

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Quote:
Originally Posted by mannydantyla View Post
Notice that the power is significantly lower at 2000 rpm than it is at 2400 rpm. You're going to have to push the go-faster peddle a little harder now with 31" tires than you would with 28". Therefore you MPG will suffer.
I've got 31" A/T's and a six speed and get 20mpg (off road only), and the XJ is far more aerodynamic than a TJ. Still gets around 26mpg highway. Stock other than tyres.

The 4.0 is over powered so dropping highway RPM can only help, even with the aero penalty of the bigger rubber.
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