[EcoCivic]

I have heard that you could see a 1-2 percent drop in gas mileage per 100 extra lbs, but would the effect of 100 lbs extra really be that small? If the effect is that small, I think it would be safe to say that DIY weight reduction is not likely to make a measurable difference in gas mileage. If a car weighs 2,500 lbs, 100 extra lbs is 4 percent more weight. Obviously weight is most significant when accelerating or going up a hill, but it would still increase rolling resistance and friction in wheel bearings and such. What do you think?