Good FE can be accomplished with a big vehicle. If you go to the garage section of the web site and click advanced, you can enter between 5 and 6 for the engine size, 13 and 15 for the compined EPA, and 1 and 100 for the percent over EPA. This will give you a representaion of what can be achieved with a larger SUV/Truck. I would start by reading the description of the cars as well as any notes on the fuel logs. You can learn a lot from there from the people who post their notes for tanks of gas and what they were doing to get thoes results. You will find that many don't enter this info in or don't keep up with the fuel log, but there are some who do.
Hope that helps.
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