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i drove 560 miles yesterday and to keep myself entertained and awake I played with having my mirrors a bit to see the results. Going 75 mph (i sacrificed fuel economy for time on this long drive) i noticed between 0.5 and 1.5 mpg. It wasn't very scientific, just having them folded in or not and resetting my scangauge and driving 20-30 miles, but i did it a number of times switching back and forth and it was consistently better.
on another point, i hit bad rain in the dark and flipped my driver side mirror out right away. in adverse weather, its really nice to have the mirrors there. i might try to rig some up to my A-pillar and see if they work. if so, i'll try to pull the stock ones off w/o damaging them. I think it would be worth 2mpg on the highway.
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