How much does going to 33's from stock 16" rims change your speedo and MPG estimate?
Thread Starter
JK Enthusiast
Joined: May 2011
Posts: 160
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From: Dallas, Texas
How much does going to 33's from stock 16" rims change your speedo and MPG estimate?
I'm trying to figure out how much my speedo and MPG Estimate changed when I went from 16" rims to 17" and 33's. It now say's I'm getting 12 mpg which can't be right. I've driven by a stationairy radar and the best I can tell I'm 3 mph off but will 3mph change my MPG estimation that much?
Last edited by Pcgizzmo; Nov 10, 2011 at 01:30 PM.
JK Freak
Joined: May 2007
Posts: 520
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From: Tigard, OR
Yes and yes. Bigger meats will have more rolling resistance if they are more aggressive...worse mileage. HOWEVER...I never take the mpg meter reading from the dash. I always fill to the click, take the odo reading and divide by the gallon qty I just stuck in the tank. Don't trust the dash for mpg. Borrow someone's portable GPS and do a comparison. The faster you go, the more "off" you'll be.