The 2008 Scion xB larger and significantly more powerful 2.4-liter four-cylinder engine is rated at 158 horsepower and teams with either a four-speed automatic or a five-speed manual transmission. The 2008 Scion xB scoots easily in and out of traffic and accelerates up to highway speeds with ease. The previous Scion xB's 30/34 mpg (city/highway) rating with the automatic wasn't especially thrifty considering its small 1.5-liter four-cylinder and modest curb weight. The new model gets 22/28 mpg using the EPA's tougher fuel economy tests for 2008, but it's also considerably heavier (about 600 pounds) and then there's that bigger engine.






