I'm searching for a new truck. I have two offers. They are: 2011 GMC Sierra Ext. Cab 4X4, SLE 5.3 Engine 6 speed auto 2011 Ford F150 Supercab, XLT 3.5 Ecoboost engine 6 speed auto. Both trucks are $34K Canadian on the road, including taxes. The GM includes a locking diff while the Ford doesn't. Fuel economy wise, Transport Canada has the 5.3 Vortec listed at 14.4L/100 km in the city or about 20 mpg and 9.5L/100 km or about 29 mpg on the highway. The Ecoboost is rated at 14L/100 km city and 9.6L/100 km highway. Performance wise the ecoboost has 365 hp and 420 lbs/ft of torque while the 5.3 has 326 hp and 348 lbs/ft of torque. Advantage Ford but it's not a big deal for me as the power is fine on the vortec. So, with price and fuel economy being pretty much the same, the next big question is maintenance and durability. I'm not familiar with turbo charged gas engines. I keep my trucks for at least 10 years. So, which engine gives me the most durability and the least maintenance? Anybody have any idea?