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Forum: General Fuel Topics

02-18-2010, 07:05 AM

Replies: 17

new tires with worse mpg???

Views: 3,366

Posted By theholycow

A 225/45R17 is 10mm wider and 8mm taller than a...

A 225/45R17 is 10mm wider and 8mm taller than a 215/45R17. Speedometer/odometer change is 1.4%.

Break-in might help, but the big help will be comparing them when they're worn to your old tires...

Forum: General Fuel Topics

02-17-2010, 06:50 PM

Replies: 17

new tires with worse mpg???

Views: 3,366

Posted By theholycow

I don't agree that wider necessarily means worse...

I don't agree that wider necessarily means worse fuel economy. In fact, the issue is rather unclear. Different theories support both wider and narrower as being better, and data is severely lacking....

Forum: General Fuel Topics

02-17-2010, 02:17 AM

Replies: 17

new tires with worse mpg???

Views: 3,366

Posted By theholycow

There is almost zero measured data about rolling...

There is almost zero measured data about rolling resistance in tires. Buying tires is a crapshoot.

Your new tires are (if the numbering is accurate, which it may not be) slightly wider and...

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