Hello GasSavers
 

I've got a 1997 Plymouth Grand Voyager SE gasoline minivan. According to the fuel economy sticker under the "Old EPA MPG" is listed as 18 City/24 Hwy with 20 Combined. Converting the "Old EPA MPG" to the "New EPA MPG" system it went to 16 City/22 Hwy with 18 Combined. Based on the "hypermiling" techniques I've learned in the past couple weeks, according to my cell phone calculator between the last fillup and the fillup today, overall I got a 22.303843 MPG which beats the "New EPA MPG" Hwy MPG.

Which board(s) should I go to so I can try to push the MPG envelope higher?

This is the perfect place to learn how to push the envelope, what kinds of mods are you looking to do?