From 26 to 29 MPG in an Oasis/Odyssey minivan!
 

Before going on a recent family road trip in the 1997 Isuzu Oasis (Honda Odyssey), I removed the factory roof rack, sunroof deflector, and the last remaining window visor. Then I folded the mirrors back. Driving with the cruise control set a couple of MPH over the speed limit (55/65 MPH), I was able to get 29.3 MPG. This van has never gotten better than 26 on this trip. The only hypermiling I did was to only use the A/C downhill. I think an upper grill block and air dam are next!

Good start!

Nicely done. (And I didn't know about the Isuzu badge engineering.)

Great going. Perhaps you should put together a belly pan too, But do check to see if any metal straps need replacing first. (I wanted to put one on my Dad's caravan and last week I saw one of the fuel tank straps rusted off, So it needed replaced.)

It really does need a belly pan, the underside is as bad as a pickup truck. I'm just worried that it will get ripped off by tall grass, speed bumps etc.

I had both tank straps break on the Civic Wagon!