[bondo]

22.5 mpg with a 5.7 liter engine is outstanding! Nice looking Tundra too.

Your aerocap does break off a bit abruptly at the end. You might build up the back with two more sections of pvc on some 90 degree joints above the ones at the lower back about 5 or six inches higher. Just close out the taller flat back with some coroplast. You could even gorilla tape in a couple of light plexiglass windows for better rearward visibility.

By doing this, it would decrease the abrupt aft angle you presntly have giving you better attachment of air. The proof will be if you can better the 22.5 mpg with this modification.

Over all very nice effort!

Oooppps. Hice = Nice I need spellcheck.
Bondo