Decent list of mods to start. Getting the 5-speed was your best move!
A cap (if conventional style) is likely going to hurt your fuel economy. But if you're willing to put some time into it, you can make a "convertible" aero style cap that will both improve your efficiency and offer you storage/sleeping space.
http://ecomodder.com/forum/showthrea...9-a-23152.html
Welcome to the forum!