Quote:
Originally Posted by ATaylorRacing
I use my 96 Geo 3 banger as a delivery truck. I usually carry from a min of 100 lbs to a max of 400 lbs. Over nearly 3 years I have found that every 100 lbs of extra wt in my car at the normal 60-65 mph costs me an extra one mpg.
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My experience is a bit different, but I dont have much in the way of instrumentation so don't swear by it. When moving a few years ago we moved about 150 miles with about a 1000 foot climb in altitude. I would load up 1000lbs+ of stuff, and didn't notice a difference in FE, I'm pretty sure I would have noticed anything greater than a 1mpg loss, which would have been about 4%.
I was adding about 30% extra weight, which is about the same you added at 400lbs (guess). What % loss in FE is yours?