In its first 1805 miles, our Tahoe has been trouble free and is averaging 14.2 mpg on conventional gasoline.

So far, our long-term 2010 Mazda 3 is averaging 24.4 mpg.

In the 1,283 city/highway miles we've traveled so far, we're averaging 19.3 mpg.

Another 4.7-liter Ram averaged 15.4 mpg with an even mix of city and highway driving.

With a fairly even mixture of city and highway driving, we're averaging 25.8 mpg over our first 2,500 miles.

So far, it has been averaging 25.6 mpg, but that's with an overload of highway miles.

We averaged 26.2 mpg for the duration of our test.

That V8-powered rig averaged just 14.5 mpg during our nearly 13,000-mile evaluation.

Our extended-use Hybrid averaged 36.5 mpg over the course of 7,260 miles.

Fuel economy is a different story, as we are averaging 14.1 mpg on gas, but just 11.6 on E85.