2008 Volvo S40 Owner's Manual - Page 55

The trip computer stores information gathered from several systems in your car and has five menus (six on Canadian models) that can be shown in the information display. MILES TO EMPTY TANK AVERAGE (average fuel consumption) INSTANTANEOUS (current fuel consumption) AVERAGE SPEED ACTUAL SPEED (current speed in m.p.h., Canadian models only) STC/DSTC (see page 149) NOTE Warning messages from the car's monitoring systems will override the trip computer function. If a warning message is shown in the information display while you are using the trip computer: 1. Acknowledge the message by pressing the READ button (A). 2. Press button A again to return to the trip computer function. Controls The trip computer functions can be accessed by twisting INFO (B) one step at a time in either direction. Twisting a final time returns you to the original function. Resetting AVERAGE (average fuel consumption) and AVERAGE SPEED can be reset. 1. Select one of these functions. 2. Press RESET (C). Holding RESET for at least five seconds resets both functions at the same time. MILES TO EMPTY TANK This function shows the approximate distance that can be driven on the fuel remaining in the tank. This calculation is based on average fuel consumption during the last 20 miles (30 km) of driving and the amount of fuel remaining in the tank when the reading was taken. When the driving distance on current fuel reserve is less than 12 miles (20 km), "---" will be displayed in the information display. AVERAGE This value indicates fuel consumption since the last time the trip computer was reset (by pressing RESET, button C).