[vanwasjm]

I got an extang evolution tonneau for my 5.7 crewmax about a month and a half ago. I am averaging about .8 mpg more (now I'm at 17.2 mpg) after the tonneau. Mostly very hilly country roads but some city and highway as well.

I went with the evolution because there is no velcro and no snaps and it is quick and easy to roll up when I need the bed for something bigger. Plus it allows for adjustment to tighten the slack between the hot summers and cold winters we get in Wisconsin. I got it for about $350 if I remember right.