I have a gas mileage worksheet for my truck and I want to figure out the estimated future oil change date. Column A is the date of fuel fillup, Column B is the total mileage. I change my oil every 3,000 miles. I would greatly appreciate some help, if you need to see the spreadsheet, just ask and I can send it...wouldn't figure it would be difficult to figure, but I've been working on a solution for about a month now....
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