84 mpg in a standard Ford Ranger??? I don't believe it.

A 2008 6-cylinder Ford Ranger is advertised to get 20 mpg on the highway. That figure is from the Ford Motor Co., so we'll assume they don't give away anything they don't have to.

They don't measure the fuel consumption on the road, but in a lab, where the truck wheels are mounted on rollers, a rolling treadmill that goes 60 mph. There is no road resistance, no wind resistance, no grades, no extremes of temperature, no use of A/C or heater, no multiple passengers, no tools, no BOB.

And they don't even use gasoline, but something called 'indolene clear' that's just for use in labs, for emission testing.

The Bluewater Network (a California-based environmental group) says those window stickers can overstate fuel mileage as much as 34%.

84 mpg? Nope. I just don't believe it. Unless it's being towed.

Sue