Bought this car used and am really only starting to drive it more frequently so I don't know what my expected mpg should actually be. I've filled my car up and drove it approx 250 miles. The fuel indicator needle has gone all the way to near empty but no light. I'm aware that the light not working might be due to the resistance wire on the sending unit. Perhaps it is gunked up?? Regardless, after I fill my tank at the station it looks as if I've only consumed 10 gallons vs. the 17 or so. I know that the sender unit malfunction is due to build up resulting in a bouncing needle, but does my scenario seem like it could also be the culprit? Are one of wires not getting the proper resistance fooling the sender into thinking the tank is near empty when it is not?

Sorry that was so wordy.. please help. lol

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1985 300d Turbo Diesel