I am retired and don't want to log for personal vs business expenses, GPS, and other complications. I am just trying to log the MPG's on my '03 Blazer for my recording of my 4.3L personal gasoline mileage. I think it is the best way to know when there is a mechanical problem and a repair or tune up is due. Nothing complicated like the internet logs wants to make it. No Tax write off's and no business expense claims. I just want to know if I am getting 17.1 mpg in mostly city driving and 19.3 mpg in mostly Hwy driving. The logs and app's I have seen on the net are way too complicated and are business oriented. I do have a Android Samsung smart phone, if there is a good app for me. But good old pen and paper is okay, too. TIA, Jim