My initial post read that i was able to get 150 mils going from 3/4 tank full to 1/2 tank full. I was thinking it may not be reading correctly. Most cars have a straight forward tank reading gauge. Meaning, if the entire guage spans say- 1 inch, it is marked at each 1/4" mark for each quarter tank.

The 300SD is not mark evenly. So, even though it is not marked evenly, is each mark actually supposed to represent 1/4 tank levels?? I dont see why on earth they would have done it like this.

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1985 300SD- 212K and running