[Noah930]

I've never had a car fancy (or gimicky) enough to have a fuel mileage calculator in it. Rather I do it the old fashioned way, taking the miles I drive between fill-ups and dividing by number gallons it takes to fill the tank back up. I might be a little bit off for any single calculation, depending on if I overfill or underfill by a smidgen, but over time I have an idea of the mileage I'm getting for any given vehicle.