Jeep's unrefined 3.7-liter V6 is the sole engine for the 2008 Liberty, so forget about the Nitro's hotter 4.0-liter or the old Liberty's common rail diesel option. That's a shame, because the 210 horsepower generated by the 3.7-liter doesn't seem worth an EPA rating of 16 in the city and 22 on the highway (15/21 with 4WD and an automatic). At least there's a six-speed manual transmission to make better use of the power than the optional four-speed automatic. The good stuff comes in the form of a new suspension, rack-and-pinion steering, and a choice between part-time Command-Trac and full-time Selec-Trac 4WD systems. The new Liberty also gets standard stability, roll mitigation, and traction control systems; ABS with brake assist; and side curtain airbags.