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On my Mustang, switching to 255 fronts and 285 rears (from 235 width all around) resulted in less than 1 mpg change on highway trips. The car is rated 15City/23Highway, and on flat terrain I could get 27 pretty consistently. Switching to wider tires didn't seem to change that, although I only have one big trip on the new tires for comparison. Anecdotal I know, but it didn't appear to change things much.
Different tires on different wheels; there's a lot of changes to consider. For me it didn't change much.
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