The TR182 is just turbo-normalized, so if you stay below 5000' or so it is no different from a normal 182 as far as fuel burn and performance go. Above that, it makes a *big* difference, you can climb at 700 fpm right up to FL200. The wheels aren't much smaller than a regular 182, I've flown mine into grass (very nice grass it's true) and seen various retractable Cessnas on (less ncie) grass in the UK, so it can't be *that* bad. (I'd much rather fly my TR182 into a so-so grass strip than a Cirrus or Columbia).
It all depends on what altitudes you need to use. If you regularly use fields with a DA above 2000', I would definitely go for the turbo.
n5296s