After spending a considerable amount of time trying to find the answer to this question myself I thought that I would provide it for anyone who might wish to know for certain in the future. 255/70r18's will fit an lr3 without rubbing, they have a 1" larger radius than the stock 255/60r18's and may rub if you are climbing rocks but otherwise work perfectly fine. Access mode is still usable although I would not suggest you drive around in it. The tires are the same width as the stock tires the full dimensions being 32x10 and the stock size being 30x10. I chose the bridgestone dueller rhs which I really like the car rides much better now than with the stock goodyears and were much cheaper than any of the stock sized tires. they also fill up the wheel wells making the car look very nice. As for mileage according to the computer which may or may not be a reliable source of information I seem to get better mileage on the high way and worse in town where I once got an average mileage of 16.4 mpg on the highway I now get a reported 17.3 mpg which with the 6% difference off of the speedometer from the bigger tires brigs me to a total of around 18.4 on average. In town I used to get around 14.2 mpg and now I get about 11.6 or with the 6% 12.3 so you could say that the difference between highway and in town fuel economy has been widened by the new tires I do know that it does run around 200-300 rpm lower than I remember at around 80 mph. anyway for whoever is interested I tried to answer any questions you might have on the subject.