Look into HHO I put it on my kids 91 mustang, 2.3 and when it was turned on on the highway got 52 MPG. Just make sure you get one the right size. And be ready for an amp draw around 25A or so. He is selling it and just put it on my 6 now, but it is not on the road. If you need a ridiculous high ratio suregrip 2.45 and higherI have one for an 8 1/4. B/O and shipping.
http://www.forabodiesonly.com/mopar/showthread.php?t=283188
http://www.forabodiesonly.com/mopar/showthread.php?t=283188