My brilliant, but well used mk2 Mondeo diesel used to put its light on, then if ignored it would go out and the gauge would climb slightly. This, I found out as I coasted to a halt on the side of the M3 once, meant the sender unit was shot rather than anything relating to the diesel fairies magicking a few more miles into the tank.
When the light was on, it was alright. When the light went out again, you had a mile. If you were lucky.
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