so i was curious if anybody has tested their mileage before and after reducing weight in their cars?? People who remove their back seats, do a CF hood, dont have their spare tire and jacks in, and dont really have a sound system....would all that increase the mileage?

 

i notice a considerable difference from when i have my subs in and after i take them out. the box weighs probably close to 80-100 lbs, and its maybe a 4 mpg difference with comparable driving.



it may not be noticeable all the time though. mathematically it makes sense. less mass means less force needed to achieve the same acceleration.