The problem we've all had is that we've read the "official" fuel consumption figures and we take those as being gospel. The fact is those figures are a total load of bollocks (B.S to you North American readers).
I quote from the Canadian Natural Resources Fuel Consumption Guide 2007...
Simulated Highway Course - "The highway test simulates a 16 km (10 mile) trip with an average speed of 77 kph (48 mph) and a top sped of 97 kph (60 mph). The test runs for 13 minutes and does not include any stops. However, the speed varies to simulate different kinds of rural and highway roads. The test begins from a hot engine start."
I don't know about the rest of you, but the only time I do 97 Kph on the highway is once on the way to 120 kmh (75 mph) and once on the way to stopping. Therefore unless you drive at the same speed 77 kph (48 mph) all the time with the occasional acceleration to a "whopping" 97 kph, no you're not going to get anywhere near the official figures they quote.
Jeeps are well known for not being fuel efficient, so if anyone buys a Nitro, which basically has the same engine, and expects to get 25 ~ 30 mpg in the city and 35+ on the highway and is upset by it's thirstyness it's their own fault, they should have done their homework first before buying.
Anyway that being said, yes the mileage ain't the best but the Nitro is still COOOOOOOL !!!