its all a matter of what rpm range your engine is in its best power range, you want to keep most of your freeway speeds in that range so you will get the best fuel mileage as thats where the engine is most efficient. it dont matter if you run 14" or 15" wheels its a matter of the diameter of the tires. you can have two sets of tires mounted on wheels then when you are going to be running on the freeway. install the larger dia. tires then when you know your going to want to run it in the 1/4 mile install the smaller dia. tires. or you could add an overdrive to the back of your trans. its kinda hard to have the best of both worlds.
also if your planing on running at that high of speed make sure your tires are rated for it. nuthing will ruin you day faster than having a tire come apart at speed. and make sure your wheel bearings are in good shape.
