Reducing unsprung mass has been often praised as a low-hanging fruit when it comes to a more spirited driving, and it also may increase fuel-efficiency, yet a weight reduction on other parts of the vehicle may not become so negligible at all. Finding the amount of places to get rid of a few ounces at each may take longer than choosing one single place to take some pounds away at once. Well, maybe you were more concerned while hauling an unusual load, so it might've been more a matter of driving style than relying on the load as some sort of an "innertial battery". Just consider the example of a big-rig going a long stretch downhill, with Jake Brakes on and some low gear in order to avoid overheating the brakes, I'm sure such conditions would prevent much of the innertia to be recovered in order to increase fuel savings...
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