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As most of you know, the Prius gas gauge is very pessimistic. So I started to determine when to fill up by calculating the amount of gas used from my average mileage and the miles I had driven. I assumed that I could go until I had used 10 gallons (easy arithmetic) with 2 gallons left in the tank. Well, the other day I ran out of gas having averaged 47.9 miles per gallon and having traveled 478 miles. In other words, having used 10 gallons like I figured.
It seems reasonable to assume the calculations for mpg and miles travelled are accurate, so the only variable left is the starting number of gallons in the tank. It appears to be difficult to be sure that the tank is full each time. So, I'm going to have to be more conservative, perhaps filling up after having used 8 gallons, or perhaps having travelled 400 or 425 miles.
It seems reasonable to assume the calculations for mpg and miles travelled are accurate, so the only variable left is the starting number of gallons in the tank. It appears to be difficult to be sure that the tank is full each time. So, I'm going to have to be more conservative, perhaps filling up after having used 8 gallons, or perhaps having travelled 400 or 425 miles.