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Old 11-14-2016, 09:44 PM
Thecastle Thecastle is offline
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Join Date: Oct 2016
Location: League City, TX
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I have an 2008 X5 4.8i, 2011 335d (tuned) in my fleet along with a Mini Cooper S. The d has the advantage of having more torque at lower rpms than the v8 allowing it to probably run a gear higher. However I'd suspect in my rig under my conditions it would be about 20% better fuel economy, so I'd be in the 9-10mpg range. It really depends on the aerodynamics of the trailer and the speed/Terrain

Once the smoking is fixed on my car, I'll probably get it tuned to see if the extra low rpm torque would allow me to hold a higher gear. But at least with my trailer 6th isn't gonna hold 65mph on flat ground, I lose speed.
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