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Car weighs 4000 lbs with a full tank of gas and me in it. I added roughly 150 lbs of weights, my toolbox (75 lbs), and a hydraulic jack (100 lbs) and went about my trip. This is an extra 8% of dead weight.
This weight could be felt on the downhill glides, but not the uphill pulses. I averaged 37 mpg for an entire tank of 600 miles. Which is roughly what I normally get.
I don't doubt it is making a difference. But in this car, in this terrain, with this driving style, it really seems to average itself out and make no noticeable difference.
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