[aerohead]

I'm looking at a Bridgestone, Dueller/Alenza (or something like that) LRR 235 75/R15 for the T-100.
*It has Traction AB which is better than the Grabber
*It has a treadwear rating of 800 which is almost twice that of the Grabber
*It's Revolutions per mile is less than the OEM tire and will reduce engine rpm by 4% (Rubber Gearing ).
*They were $112 each at Tire Rack's website.
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Long ago,when the metric tires were coming into the USA,at least one article came out on TPC tire technology,in CAR and DRIVER.
*Larger diameter allowed each tread element fewer road strikes per revolution,and with hysteresis factored in,the tire ran cooler,wasted less energy in deforming each tread element,for better mpg.
*Quiet bands were removed,as they absorbed power.
*Noise was an issue and the EPA was considering legislation for tire noise criteria.
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*Wider tires have greater aerodynamic drag although we can modify for that.
*Early LRR concept tires had no real world traction,so perhaps as far as safety goes,maybe we accept a compromise in efficiency until more black magic creates narrow,high grip.
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Slowing the engine down is 'typically' an efficiency move,according to Ricardo Engineering Consultants.
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And many messengers emphasize the importance for re-gearing cars which have been streamlined,to get the full benefit of a constant BSFC.