Group: Members
Posts: 21
Joined: 12-April 08
Member No.: 43,932
Location: Los Angeles, USA
Drives: 2008 Hyundai Elentra SE 2.0 Auto Status: OFFLINE
If you are talking about the trip computer that comes with the SE or Limited.
Yes, you have to reset it to get your MPG average for your new tank of gas. If you don't reset, it'll just average your MPG from your most recent reset.
The same goes with the the average MPH in the trip computer.