http://www.fueleconomy.gov/feg/findacar.htm - you can find all the mileage info on any model here. Diesel engines get better mileage, some of the Jeep models offer those. Hybrids only get good mileage if you live & work in the city or suburb next to a city you do all your commuting in...not on long open stretches like highways. Diesels beat them in the vast majority of tests: http://www.hybridcars.com/hybrid-versus-diesel.html

If you don't need the off-road capabilities, You may want to consider a CUV (Crossover Utility Vehicle, somewhere between a minivan & SUV) as they are lighter and get better mileage than an SUV, plus ride on a smoother riding car, not truck, platform.