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Old 06-17-2008, 08:01 PM   #1 (permalink)
07b2300
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Join Date: Jun 2008
Location: BC, Canada
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07b2300 - '07 Mazda B2300
90 day: 27.97 mpg (US)
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New tires for the truck--rolling resistance and mpg savings

Hi, I'm thinking about trading in my larger, somewhat aggressive LT rated tires for some stock height ones. Costco is having a sale on michelins right now and I want to take advantage of it.

The stock size is 225/70/15 and the best I can find information on is the Michelin LTX M/S. In 2005 Consumer Reports gave them a rolling resistance rating of 57 (but I don't have the information on the size of tire they tested), and said that the tires have good "Rolling resistance; winter grip; Dry braking"

But I have also been reading great things about the Michelin "Radial X" all season. Prius drivers say good thing about the fuel economy and general performance, and Consumer Reports just gave them top ranks on rolling resistance (but give no numbers). They don't come in my size but come in a close size 215/75/15.

So the LTX's would have a shorter sidewall which is supposedly better for rolling resistance and are likely stronger (for a truck), but the Radial X's are narrower, lighter, and less aggressive.

So I'm stuck between them with little real info and need convincing to take the leap to the wimpier but more efficient tire! Anyone have any ideas how much savings in fuel economy the Michelin X would give? BTW, my 07 B2300 truck is a 4x2 has a fuel efficient four banger (rated at 29 mpgs highway).

Thanks!!

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