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Old 08-28-2008, 12:42 PM   #1 (permalink)
SirKeats
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Join Date: May 2008
Location: Southern Oregon
Posts: 111

GeRide - '89 Geo Metro *XFi
90 day: 54.26 mpg (US)
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89 Metro XFI - MPG Decrease w/ Larger Tires

So I'm pretty confused. I replaced my 12" rims with 13" ones and my MPG has dropped by 3-4 mpgs.

I got 155/80 R13's and am now pulling 49mpg's (last two tanks). Back on the R12's I was getting 52-53mpgs.

Driving hasn't changed (actually driving a bit slower to compensate for the 2mph increase the larger wheels/tires produce). No other mods besides the wheels and tires.

What's going on??

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