I haven't weighed the car before and after, but there should be little change in weight. The mods are made of lightweight aluminum and coroplast and I removed a heavy glass and steel rear hatch to install the boattail.
I regularly make runs carrying several hundred pounds of livestock feed from Tractor Supply. Increased weight has the same effect on my car as it does on any other car. It hurts mileage if you are having to use the brakes very often (urban/hilly), otherwise it has little effect on mileage (rural/flat).
|