Set up a parts number with pricing equaling 1 quart. When your oil is delivered multiply
the gallons received by 4 to get the # of quarts to receipt. When full to the max it should equal 2000 qts. If all sales are sold as qts that should end the problem.
My 660 gal tank has a gauge but is broken down by inches. I use number of gallons per inch and multiple by 4 to audit the controlled oil inventory in my system and than compare that to my book figure. it took a couple of months to fine tune the gallons per inch.
To give your self a cushion in case of error in calculation bump your cost $ .10 per quart. You can always get it back if you didn't need it.
[This message has been edited by MMiller (edited 09-10-2002).]