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Yeah, the 4x4 makes a big difference -- lots of weight to haul around. I'm going to look around for one of those air gates. I returned from a business trip tonight and drove with the gate lowered and I could tell a difference even at the gas pedal. The truck seemed smoother and a little more powerful. I bet it makes a difference on the mileage too. I want to get an air gate and keep it in the cab -- I won't even install it unless I have to carry something loose in the back.
BTW -- the 4-cylinder engines don't have serviceable valvetrain parts. It's a timing ~chain~ which is maintenance-free. The tensioner and guide sometimes fail, which needs repairing, but there is no maintenance needed like there is with an engine with a rubber timing belt (like the VG3_E series engines).
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