Hello Smog,
I built a tonneau cover out of aluminum diamond plate for about $366.00 and it locks too. It's not as aero as a fastback might be, but since I use my truck's bed, I needed something easier to remove. I think I might be able to hit pretty close to 30 MPG, but my best tank so far is 26.66 MPG. To do 30MPG I think it will take some extreme Hypermiling.
Thanks for the welcome!
Later,
Allan Greenblazer
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