Fifth Gear: Prius vs Patriot

The diesel Jeep is as fuel efficient as the hybrid Toyota?!

Had we relied on the onboard computers, the Prius would have won by a landslide, as by the end of the trip they read 57mpg and 42mpg for the Prius and Jeep respectively.

However, to get the real figure, we calculated consumption based on how much fuel each car had used over the 160 miles. The result was astonishing: both cars had used nearly identical amounts of fuel. The Jeep had averaged 38.9 mpg - only 3.1 mpg less than its computer had recorded. However, the computer of the Prius appeared to be telling whoppers: it actually achieved just 39.9 mpg - a massive 17.1 mpg less than it had claimed.

http://fifthgear.five.tv/jsp/5gmain.jsp?lnk=601&featureid=1196&pageid=-1