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Originally Posted by sarguy01
They are 235/65/R17 Michelin Energy MXV4 Plus's. They are LRR's (low rolling resistance), but the max sidewall pressure is only 44 psi, which I am currently at. They are 880$ a set.
I could get new LRR (Low rolling resistance) tires. There are several choices. ContiProContact's are 44 psi max with a weight of 27 pounds for 436$. GoodyearAssurance Fuel Max's are 51 psi, 27 lbs, and 452$. Grabber HTS's are highly rated at Tirerack.com and 51 psi, 33 lbs and 480$. Shipping is another 45$.
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At these prices it looks like a no-brainer ... if you can get at least say 40.000 miles out of these.
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I am also thinking about different tire sizes. Maybe a narrower but taller tire for the highway mileage?
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A narrower tyre will need to have a higher profile to match the overall diameter.
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Or for acceleration, a narrower and shorter tire?
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A smaller diameter will increase rpm at any given speed over what you're doing now - more rpm normally translates in more fuel used.
What's the rim width of your wheels?
What's the narrowest tyre you can legally fit ?
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A lighter tire with higher sidewall pressure?
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I'm having a tough time seeing any FE improvements from my new more aerodynamic wheels, which are some 6 lbs heavier than the wheels they replaced.
These 6 lbs can be felt in the heavier steering, and are likely fighting every acceleration !
I'd go for a lighter tyre with higher sidewall pressure.
If you can go narrower while keeping the original overall diameter, that'll normally also reduce weight.