Quote:
Originally Posted by sendler
Does a lighter battery save fuel? What is the payback on the Lithium battery? Or thousands of dollars of rear end pieces?
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In theory it does. But unless your car is particularly weight sensitive (like my 2 cyl turbo Fiat), then the gains are tiny.
For my conventional 1.6L Renault, I see a deficit of 0.0018L/ 100km per pound of weight in 100% city use (20 MPH AVG speed). That figure comes from towing a trailer that no doubt also adds aero drag (it's slightly taller than the tow vehicle) and there's rolling drag from an extra axle.
So best case for a NA engine you might gain 0.2L/100km per hundred pounds.