Quote:
Originally Posted by tasdrouille
The aero improvement given by those is marginal at best. Unless you're going the DIY route I beleive your money would be better spent elsewhere.
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I agree with tasdrouille.
It's going to be a small benefit, likely not big enough to show up above the normal variation in your tank MPG.
It certainly won't hurt, so if you want to do it, do it! But there's lower hanging fruit to be found.