Anything you can do in a week would only pay off over 700 miles. Save it for when you get back, then get serious.
mcrews suggestion is a good one. Adjusting the 'nut behind the wheel' happens after you hit the road.
Quote:
I have a 2005 Mazda 3 hatchback and i was wondering what you think the largest area for aero improvement would be if i could only do one mod.
I was on the fence between wheel skirts, a 24in roof extension or a diffuser.
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I'm with aerohead — if only allowed one mod — a 24" overall extension. It would approximate to an oval per Morelli's Urban Car concept and have a ring shaped plasma actuator to pinch off the wake.