gas

[N_Jay]

Originally posted by youbetcha
Funny thing in comparison, we know how much gas we put in the tank at the last fill-up, to the accuracy of a thousandth of a gallon.

But, we don't know how much was left, or if we filled it to the same point as we started, so that number, even if extremely accurate is meaningless without a lot of other data that is not as accurate.

[tim.s]

So I guess to be sure, someone needs to drain their tank dry, fill it with a predefined volume, and then drive until it is dry again. Repeat.

Any volunteers?

Oh, but then their speedometer could be off as much as ±3% and mistating the miles traveled, so we still wouldn't know.

BTW, I saw Mythbuster do what I described above so that they could compare the change in MPG with the tailgate up and the tailgate down on a pickup.

[N_Jay]

Originally posted by tim.s
So I guess to be sure, someone needs to drain their tank dry, fill it with a predefined volume, and then drive until it is dry again. Repeat.

Any volunteers?

Oh, but then their speedometer could be off as much as ±3% and mistating the miles traveled, so we still wouldn't know.

BTW, I saw Mythbuster do what I described above so that they could compare the change in MPG with the tailgate up and the tailgate down on a pickup.

You can get "accurate enough" measurements by filling up in a simple consistent manner. (e.g. fully inserted nossel, off at first click), measuring fuel used over 3 consecutive talk-fulls.

[evarsallona]

Plus must be the except same accurate data and driving conditions as example
Time
Roads
Tires
Vehicle
Weight
Gas
Driver
Weather

Note: who cares just enjoy driving your Pilot