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lose of mpg after 60-65 is exponetial. It's dramatic. On any vehicle.
The gain in areodynamics is incremental.
compound that with a 4x4 set up that is exposed below the trim line.
On my Q45, I had already installed a body kit that was 2' lower.
But as others have stated, without a change in mentality, the incremental change caused by 'boltons' would be offset by the driving style that needs to do 80mph.
planning ahead, slowing w/ purpose......
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