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Even if you don't have a scangauge, you can use coasting tests to check the effectiveness of your mods. If you have a mix of downhill coasts along your routes where you either; slowly lose speed, maintain speed, or, gain speed, then notice what change the aero mod has done to your car's performance on these downhills. As I added aeromods to my car, downhills where I used to slowly lose speed gradually changed to maintain speed, then to gain speed. Its all relative and you have no hard and fast numbers, but it is an easy way to test your progress. You have to make these coasting tests starting at the same speed at the top of the downhill and at close to the same ambient temperature and not drafting another vehicle to make valid comparisons, but this is something that is easy to do if you drive the same route at the same time every day.
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