tonneau covers suggestions for 2012 tacoma

any suggestions for bed covers for 2012 tacomas? specifically a retractable one? Looking to get one for my ride. Also, for those that are already running with a bed cover, do they really improve gas mileage? Thanks.

 

I have the bakflip roll-x on mine. I drove 3,000 miles with mine and had the bed and back seat loaded up 300-400lbs of luggage and other things. It was me and my wife traveling. I averaged 20-21 mpg driving 70-75 mph on average. I don't know if the cover made a noticeable difference, but I am surprised I did that well with that much weight, so maybe it did help.

 

It also did well keeping my things dry during heavy rain on one of the days on the trip.