Road Test of 4 Fuel-Efficiency iPhone Apps

Lately it seems the only thing more dependable than the force of gravity is the inevitable rise in gas prices, which seem to be resisting the force of gravity altogether. And this has frugal drivers squeezing every last mile from an increasingly expensive tank of fuel.

Of course, now there's an app for that. In fact, there are several apps that can help you gauge your car's fuel efficiency at every fill-up, track monthly fuel costs and even store relevant data such as your car's correct tire pressure. To help you decide which of these apps are best, we tested ... Back to article