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Originally Posted by Brit_fuel_saver
Here in the UK we're told to get rid of the excess weight.
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Everyone everywhere is told that. If you can manage to remove a significant amount of weight,
and you don't drive efficiently, then the weight removal will have a reasonable effect. Other than that, it's just one of those things that's "common knowledge" but fails to produce results.
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As we all know a car uses more fuel and energy to move this total weight.
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Not quite. It uses more energy to
accelerate that weight -- but anyone making even a minor effort to save fuel is probably going to do the most important and easiest thing: don't discard the energy. People trying to save gas drive smoothly instead of constantly accelerating hard and decelerating hard.
You accelerate, which uses energy; then, if you're smart, you don't discard that energy by braking. You don't accelerate so much that you're going to have to slam on your brakes, and you don't brake down to a stop for every slight curve. Instead, you plan ahead, accelerate as much as necessary to get somewhere at the right speed.
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Also you have to remember here in the UK our cars are typicaly less heavy and smaller than the cars in the US, for example a Licoln towncar, GMC Truck/pick up and Voyager. In a light compact sized vehicle (such as mine)
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I googled up the weight of your car for my calculations. You said the Vauxhall Astra is approximately the same car as the Chevy Cobalt. I figure it's probably a little lighter, since it probably has a smaller engine (as it seems many equivalent models do across the pond).
Anyway, for an 18kg item to make a noticable difference with a smooth driver, your car would probably have to weigh 200kg.
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short of stripping the seats, carpet, roof lining and door trims I'll try out the more practical fuel saving techniques.
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Well, that was my point -- weight loss is not a practical fuel saving technique for most people. You'd be surprised how little the seats, carpet, roof lining, and door trims weigh -- do some googling, people report removing 10 to 40 kg in reports I remember. Certainly leave the spare out if you don't want it, but any fuel savings will not be because you removed 1% extra weight.
Most practical fuel saving techniques that actually work are driving techniques. There are some modifications that can help, but as said by someone else on this forum, the best nut to adjust is the one behind the wheel.