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I think it's one of those YMMV things... My experience with oversized tires is mixed. The F150 with a/t was already geared tall and had a propensity to downshift at the slightest provocation; I went taller with the tires and of course the downshifting became even more frequent and I noticed a slight fe drop. But then I've had older vehicles- stick and auto- that lacked OD really benefit from taller tires. Then too, I suspect if you do lots of city driving the weight increase if there is one AND the "gyro" increase- even if there isn't a weight increase- might be detrimental; whereas if you mainly highway cruise I'd say it isn't a factor.
Great answer huh.
It would be nice if you knew someone (friend, neighbor, car club member, friend/relative that works at a tire store, fellow ecomodder, etc., or maybe even a business that has an ironclad trial/satisfaction guaranteed return period) that had rims/tires like what you are considering that would loan them to you for a bit of testing, so that you didn't have to make such a huge financial commitment for such an unknown.
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