there has been reports of a 2 mpg increase with a cover over the bed or the tailgate down. i think it was a thread on here a while back...

1969 K20 , with a '67 front clip. fleetside. 292, 3x1 offy, headers. sm465 4spd. getting put back together, almost ready for paint.
doing it all myself.
19 and lovin' it.

"proper" is so over-rated.

.later days.
.sam.