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hojosan · 04-11-2009, 08:08 AM

Thanks for the advice.

I had posted about this topic on a Focus-specific enthusiast site, where the general argument was "Bigger tires have a much higher moment of inertia, thus chew up any gains in efficiency from higher gearing by causing you to feed tons more energy into spinning them up." In my reading on this site as well as gassavers.org, I found other data that made me think that the answer probably is to go larger, to a certain point.

I have located some fairly cheap tires ($72-$78 each, free shipping) from savontires.com in the 205/65R16 size and will probably just get 4 of them in the next couple of months. Once I get a tank or two of fuel under my belt, I will post an update regarding my updated MPG ratings.

04-11-2009, 08:08 AM	#13 (permalink)
hojosan EcoModding Lurker Join Date: Apr 2009 Location: Kansas City Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	Thanks for the advice. I had posted about this topic on a Focus-specific enthusiast site, where the general argument was "Bigger tires have a much higher moment of inertia, thus chew up any gains in efficiency from higher gearing by causing you to feed tons more energy into spinning them up." In my reading on this site as well as gassavers.org, I found other data that made me think that the answer probably is to go larger, to a certain point. I have located some fairly cheap tires ($72-$78 each, free shipping) from savontires.com in the 205/65R16 size and will probably just get 4 of them in the next couple of months. Once I get a tank or two of fuel under my belt, I will post an update regarding my updated MPG ratings.