Need some help on MPG calculations please

808subaru Need some help on MPG... 07-07-2008, 06:40 PM

8307c4 Yeah get 195 55's put on like... 07-07-2008, 07:05 PM

theholycow Did you calculate in your... 07-08-2008, 07:14 AM

mrmad I wouldn't really worry about... 07-08-2008, 09:01 AM

thornburg Interesting idea, but Google... 07-08-2008, 10:03 AM

R.I.D.E. I use 50 miles of mile... 07-08-2008, 10:21 AM

07-07-2008, 06:40 PM	#1
808subaru Junior Member Join Date: Nov 2009 Posts: 13	Need some help on MPG calculations please Hello. I have recently changed from the stock 185/60/15 tires to a hankook rs-2 195/50/15. The speedometer change as calculated was 4.5%. http://www.miata.net/cgi-bin/tirescgi But if i go with MPG, it actually dropped on my last tank. Is there a calcuation that i can use to compensate for the shorter sidewall difference? This is for a 07 toyota yaris sedan, if anyone was interested in that. Thanks guys!

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