CD-specification Senators come with a multifunction Trip Computer which is excellent to play with. It always shows the time at the bottom, and is controlled by a two-buttoned control near the handbrake.

The first function is a instant fuel consumption read-out
trip computer
Second shows the average consumption. This is reset by holding down the second button.
trip computer
Next shows the average journey speed. This too is reset by holding down the second button.
trip computer
The number of miles that are left till fill-up time, using the current consumption and tank level as a guide
trip computer
Stop watch
Stop watch
Outside temperature
Outside temperature
Trip Computer
Trip Computer Vauxhall Senator
Trip Computer Vauxhall Senator
Trip Computer Vauxhall Senator