Fuel Economy rates the 4.2 liter V6 with 5 speed manual at 14 city/19 hwy. I'm thinking you might see 25 mpg under perfect conditions.
Apologize for the problem with the curtian latch. I knew I should have fiberglassed that in other than using Dynaglass only.
alohaspirit, here is a picture of the lid in the camping mode. You can drive with it in this position also but aerodynamics go all to heck. You can also remove the top entirely, if you need to haul taller cargo, and leave the bottom portion clamped in place.
Bondo