Depending on which 2012 Compass you choose—and your level of green expectations—you could be satisfied, or you could be shocked and disappointed.
None of the Jeep Compass models quite hit 30 mpg, which is a bit surprising for a compact crossover that's definitely on the compact side of the spectrum. And while the Compass offers two closely related (and closely sized) four-cylinder engines, its ratings can vary quite widely. EPA City ratings range from 20 to 23 mpg, and highway ratings span up to 29.
Base front-wheel-drive, manual-transmission Compass models are the best of the bunch, at 23/29, while with 4WD and the Freedom Drive II Off-Road Package, the Compass gets a miserable 20 mpg city, 23 highway—that's on par, or even worse, than some much larger SUVs with more space and serious towing ability.
To sum, it's definitely relative here; compared to the front-wheel-drive Compass models, you're much better off, and much greener, in choosing another compact crossover or wagon. But if off-road capability is a priority, the Compass is respectable if not compelling.