Overstated mileage?
#11
Re: Overstated mileage?
Originally Posted by greenvillehybrid
The last odometer reading divided by the gallons filled just before the current fill up gives an accurate mpg. In my spreadsheet the value of 26.98 mpg is inaccurate since it shows the 14 gallons filled on 10/14 but does not show the miles obtained from it. Either I should wait for the next odometer reading before the next fill up or remove the 14.00 gallons to show the last accurate mpg of 34.59 mpg
In other words, you are always using this fillup's gallons to determine the last fillup's fuel economy.
#12
Re: Overstated mileage?
Originally Posted by ag4ever
This is not exactly true, unless you started with an empty tank, and even then you must add fuel to the exact same level each time, and use the fuel to the exact same level each time. if you run the tank more empty, it will skew your results. The current fill is equivelent to the amount of fuel used IF YOU STARTED WITH A FULL TANK. What you are actually measuring is the amount of fuel neede to replace the actual fuel used. This means that if you got your car with a half a tank of fuel, you must start you mileage recordings after you filled the first time, as that is your baseline measurement. You also must start your measurements with a full tank and end with a full tank. This does not mean that you can not add only 5 gallons here and ther, but you must get a full tank to get reasonably accurate measurements at the time you want your average fuel economy.
In other words, you are always using this fillup's gallons to determine the last fillup's fuel economy.
In other words, you are always using this fillup's gallons to determine the last fillup's fuel economy.
My point is that the variations will even out after 30 or 40 fill ups and at that point even recording odometer at a quarter tank fill up will not make much difference (maybe 0.25 mpg) to the mileage as only 6 gallons will be left in the tank. Obviously you cannot use the gallons of the very last fill up to calculate mpg, as I already indicated in my previous post.
I would welcome someone else who has the receipts to remove my readings and add their own for a few fill ups and see how their mpg is compared to the car’s interpretation.
#14
Re: Overstated mileage?
Follow up questions: if the car's odometer is understating our mileage, doesn't the car's calculation of MPG use that understated mileage? If so this doesn't explain the discrepancy. Or are you saying that the MPG calculation uses some other measurement of mileage or some other way of calculating altogether? Also, does Toyota know their odometers understate the distance travelled? It seems this would be something they would want to fix...
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