Have re-set it several times according to manual, but keeps going right up to 99.9 MPG and stays there. Have driven about 400miles since installing the new battery.

Ideas?

Thanks.

Gale's Repair page at http://www.nmia.com/~dgnrg/page_2.htm has some stuff about the On Board Computer (OBC) including a reset. It's about 1/2 way down the page.