We have been researching this very thing.
Found this on another site:
2007 Most and Least Fuel Efficient Trucks,Vans and SUVs
EPA Size Classes
(ranked by city mpg)
Make/Model MPG
City Hwy
Most Efficient Pickup Trucks:
Ford Ranger Pickup 2WD
4 cyl, 2.3 L, Manual(5), Regular 24 29
Mazda B2300 2WD
4 cyl, 2.3 L, Manual(5), Regular 24 29
Toyota Tacoma 2WD
4 cyl, 2.7 L, Automatic(4), Regular 21 27
Most Efficient Sport Utility Vehicles:
Ford Escape Hybrid FWD
4 cyl, 2.3 L, Automatic(CVT), Regular 36 31
Jeep Compass 4WD
4 cyl, 2.4 L, Man(5), Regular 25 29
Jeep Patriot 4WD
4 cyl, 2.4 L, Man(5), Regular 25 29
Most Efficient Minivans:
Dodge Caravan 2WD
4 cyl, 2.4 L, Auto(4), Regular 20 26
Most Efficient Cargo Vans:
Chevrolet Van 1500/2500 2WD
6 cyl, 4.3 L, Automatic(4), Regular 15 20
Chevrolet Van 1500/2500 2WD
8 cyl, 5.3 L, Automatic(4), Regular
GMC Savana 1500/2500 2WD
6 cyl, 4.3 L, Automatic(4), Regular 15 20
GMC Savana 1500/2500 2WD
8 cyl, 5.3 L, Automatic(4), Regular
It looked better in the colored chart found here:
http://www.fueleconomy.gov/feg/bestworstEPAtrucks.htm