There are two readings that you can alter. One for trip A to B (or whenever you reset your readings) and the other is overall MPG (which you can also reset to match your first reading if you reset them at the same time).
2008 E90 M3
: Alpine White/ Fox Red Novillo
/ Brushed Aluminum
| Premium | Cold Weather | Technology | EPS | PDC | Ipod/USB
:: Adelei's Gas Mileage