Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - I'd like to add sound deadening material to my car. How adversely will it affect MPG?

GearHead · 05-05-2015, 04:30 PM

Hey all,

I'd like to add sound deadening material to my car. I'm going to be using Spectrum (paint like substance). I was told the dry weight is about 70 lbs for the whole inside of the car with the floor only being covered. If it's a significant decrease in MPG, I'll probably only do the trunk.

My question to you all is, how badly will this hurt MPG? I already have about 40 lbs of audio equipment. Most of that is just a sub, and an amp. Is 70 lbs really that much more?

I have a Honda Civic VX.

05-05-2015, 04:30 PM	#1 (permalink)
GearHead EcoModding Lurker Join Date: Apr 2015 Location: Earth Posts: 45 Thanks: 1 Thanked 1 Time in 1 Post	I'd like to add sound deadening material to my car. How adversely will it affect MPG? Hey all, I'd like to add sound deadening material to my car. I'm going to be using Spectrum (paint like substance). I was told the dry weight is about 70 lbs for the whole inside of the car with the floor only being covered. If it's a significant decrease in MPG, I'll probably only do the trunk. My question to you all is, how badly will this hurt MPG? I already have about 40 lbs of audio equipment. Most of that is just a sub, and an amp. Is 70 lbs really that much more? I have a Honda Civic VX.