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Higher or lower UTQG does not necessarily correlate into rolling resistance, especially across different brands. I have seen it work both ways on different occasions. Way too many variables between tread patterns, tread compounds, psi ranges, actual diameters, etcetera to directly correlate.
Also to clarify the three UTQG ratings are for treadwear, traction, and temperature. The speed rating is part of the service description, which consists of a load index and a speed rating.
For example, compare the following:
Michelin LTX M/S2
Size: P265/75R16
Serv. Desc: 114T
UTQG: 720 A A
Dick Cepek Trail Country
Size: 265/75R16
Serv. Desc: 116T
UTQG: 500 A B
Yes, a bit of an extreme example, but it should be clear from looking at the tread patterns which tire has lower RR, and note that the UTQG doesn’t correlate.
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