Mileage Database Glitches
GH Folks,
I have had my HCH II for over a year. One of my regular checks in that time is to compare the data on the Prius II vs the HCH II. Lately (last two months), the difference in overall mpg (average) has gone from about .6 mpg to 1.5 mpg in favor of the Prius. This does not make sense. I looked in both databases, and saw that there are a number of results that really affect the overall MPG's in both cars. This is especially true of the lowest MPG cars. Some are obvious data entry errors, and many are one tank from a driver who drives fast and drives in a colder part of the US. Another problem is that some entries show 3.000 total miles - BUT no tanks.
I wonder if some entry limitations would make the entire databases for all cars more realistic. For example, requiring that a minimum of three tanks be entered, and not accepting total miles without the tanks which correspond to them. It crosses my mind that "bashers" of a particular car could intentionally enter false data on fictitious cars to make them appear to be very poor at gas mileage.
Just my two cents worth. I try to keep all my calculation as exact as I can. I enter the gas and miles to the decimal point that I have - I don't round off tenths etc. My gallons of gas go to the thousandth, and miles to the tenth. I DO round the subsequent calculations up or down to the closest integer.
I wonder if other hybrid owners have seen this?
  Don
Best tank 67.5 mpg (555.5 mi.)
Best trip 91.5 mpg (42.2 mi.)
|