Yes - gas mileage can drop (or increase).
>The rolling resistance of a particular tire can have a significant >impact on mileage.
>
>For what its worth (I have a Forester), and just put the Triple treads
>on about a month ago.
>They are excellent and highly recommend them for anyone who needs an
>all weather tire w/o sacrificing in performance to much. The 80,000
>mile warranty is especially nice too.
>
>I haven't noticed any drop in mileage, and they are quieter than the
>stock Geolanders that came on the car.
The RE-92's ARE "gumby sidewall" low rolling resistance tires (almost all OEM rubber is). When I switched to RE-950, my mileage dropped but my cornering improved. :^) -Danny