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Originally Posted by CapriRacer
Barry's Tire Tech
This is an analysis of some data submitted to the California Energy Commission. Among the data is a study of tire size. Needless to say, that there are a lot of factors, but if we isolate tire size: Bigger = better - and by bigger, the data seems to point to every parameter in the numbers used to delinate a "size" - wider or taller or larger in rim diameter.
But there is such a huge difference between tires (meaning make and model), your point is well taken.
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This is only for a specific brand (Goodyear) and tire type (Integrity), and probably a specific year or years.
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I am not sure where I picked this up, but all these tires are Goodyear Integrity's
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Someone could say that Goodyear Integrity tires tend to exhibit a lower RRC as tire size increases, but saying the same thing about tires in general is not warranted w/o more data (multiple brands, tire types, sizes, and hopefully years). Even then, saying the bigger=better is incorrect. On page 31 of the pdf, the RRC for 15" tires is better than for larger 16" tires. My WAG is that the tires most commonly used in passenger vehicles where fuel efficiency is a concern, which I'm guessing are 15", are also where Goodyear wants to minimize the RRC.