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Be careful about wider, sometimes it cant be helped but it will have the opposite effect, especially in the front where the width also affects wind resistance more, more rubber on the ground equals more rolling resistance. The extreme of this in my experience was going from a 185 70 13 (I believe) on my 88 Honda civic to a 205 60 14 free fom my brothers del sol, I lost 6 mpg on the highway dropping from 42 to 36 (of course the handling was hugely improved)
Going the other way I had a 92 Crown Vic (police pkg) and going from the stock 225/70 15 to a 235/70 in front and a 255/70 in the rear brought my hwy mpg from 22/23 to 26/27 with an all time best of 30mpg but brought my city mpg from 17/18 down to 14/15 which at the time didnt matter much but once I started college kinda sucked.
I probably would have done better with 235's front and rear but that 16yr old car nut in my head said ya gotta have big tires,,,, and I listened to him a lot more back then
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