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Ok I may ignore the mirrors then if the benefit doesn't match the added risk/hassle.
wmjinman: You Jimmy is rated 17 mpg combined and you got 24 mpg that is an increase of ~40%. A grand caravan (and most other vans) are rated for 23 combined. Would only need a 30% increase to hit 30mpg. I know it is pushing it but with good driving and a few mods I think that could be attainable (from what I've been reading).
On the issue of roof racks, if the van comes with cross bars I had planned on removing them but what about just the bars running front to back? Do those make much difference if there are no crossbars?
I've read a few aero projects on here and am debating having a good amount of coroplast on hand before picking up the mini-van. Not sure what the best balance of time/effort vs mileage increase would be though. I think a belly pan is out of the question but an air dam on the front or just flaps for both sets of tires may not be.
I think I will also cover the wipers with coroplast instead of trying to take them off. Not sure if I will try and leave it short enough so the wipers can still function without taking it off or whether I will extend it all the way to the window to try and smooth that transition.
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