economy for my gmc's toolboxes

[zjrog]

Originally Posted by jen6238

pix of my mod. I know it's not much but that bothered me every time i looked in the side mirror. A big flat windbreak stealin' gas!!!!! Grrrrr. Anyway this is what i did and it is creating conversation about mileage. Most of the comments are positive. I walk and ride my bicycle (an old racer) when i'm not working so i make up for my gmc just a little......

Any guess on if that has made an improvement? Looks simple, but probably helps a bit...

[TestDrive]

What sort of material did you use for the mod?