Honestly, any company that tells you their spark plug wires will give you a 10% increase in MPG is smoking crack. Not going to happen (no offense). <img border="0" title="" alt="[Wink]" src="wink.gif" />
Your best mileage can be had by making sure you change the oil, filter, and air filter often, use good gas, and keep the engine tuned.
Any set of quality wires will be good, I like Belden Wires (been around forever, time-tested), but there are many others. Accel is just cheap imitation crap, don't even bother with them, LOL. Jacobs wires are probably good, but don't expect 10% increase in MPG from them. Any good plugs, Bosch, Champion, etc.