Why does running one size bigger tires increase fuel economy?

[GasSavers_worthywads]

Originally Posted by philmcneal

damn all this tire talk, all i know what to do is pump them near the 50 PSI limit. By the way do alloy wheels cost more to replace than standard steel wheels?

You can usually get steel wheels for free.

[Compaq888]

I got 4 steel wheels for $125. I'd like to get some alloy wheels for my car but the cheapest I found was $115 for each.

[SVOboy]

My 9 pound alloys just came today. 100 bucks, 2 day shipping, superb condition.

[Compaq888]

good. Now your car will lose some more weight.

[krousdb]

Originally Posted by SVOboy

My 9 pound alloys just came today. 100 bucks, 2 day shipping, superb condition.

Keep your eyes open for a set for me. Please? :-)

[SVOboy]

Sure thing, if you wanna pay shipping I know a guy giving away almost new tires also (that fit the rims). He's in South NY so shipping by DHL would be very little, it cost like 25 bucks to send my rims from SC and that's further (farther?) away.