I'd still try a belly pan though. since your commute is mainly highway, that slightly better aero could mean 2-3 mpg's better. and do a grille block over the intake, so you can cause the intake to run hotter, making the engine need more o2, you now get less restriction because you open the throttle plate more, and reduce pumping loss at the throttle plate. It shouldn't use more gas even though your on the throttle just a little more, because the air/fuel ratio really isn't an air/fuel ratio, but an 02/fuel ratio. so you get better aero and reduced restriction.
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