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You can't stretch 14" tires on 15" wheels, if that's what you're thinking. You'd have to buy 14" wheels, and you'd likely never make up the wheel cost in fuel savings.
You could go with 195 or 185 width tires in the rear, 60 or 65 profile, on your 15" wheels, but I wouldn't do it. There's minimal benefit mpg-wise, from the swap. Offsetting those questionable benefits, you're changing your car's aerodynamics, giving it a nose-up stance that might lift dangerously in cross- and headwinds. The skinnier rears might adversely affect emergency maneuvers. You'd be seriously mismatched if you had to replace a front flat with one of your rears, risking transmission damage driving the car.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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