Gas capacity and mileage questions

[e30cabrio]

Thanks, yes I unlocked it to see voltage when my alternator went on hiatus. I would need to do 4 presses in test 20 if I find 18 is correct but I am showing 14?

[Qsilver7]

Originally Posted by e30cabrio

Thanks, yes I unlocked it to see voltage when my alternator went on hiatus. I would need to do 4 presses in test 20 if I find 18 is correct but I am showing 14?

No, I think you're misunderstanding TEST 20. If no one has changed your correction factor...it should read 1000 when you open TEST 20. Since the value can be anywhere from 750-1250...if you're at 1000...4 presses of the button would only reduce the number to 996. You have to enter correct values for the equation that is given so that you can find what "VK" is for your fuel consumption. It's really simple once you have your avg "actual" MPG...you divide that with the OBC's "displayed" MPG, then multiply that number by 1000. It should be a number somewhere between 750-1250. The number you come up with is what you should change TEST 20 to.

(see...your high school math teacher was right...someday you'd need to understand/use equations to figure out a problem)

VK= (actual mileage/display mileage) x 1000

As I mentioned in the previous post...the best way to do the correction value is to "average" out several fuel fill-ups of your normal driving habits/environment...then use that "actual MPG" as the variable in the corrective equation.

For example, as some others members have mentioned above...I keep track of every fuel fill-up...and you can see in the Excel file below...sometimes the actual MPG calculation matches the OBC's displayed MPG...sometimes it's off by a little over 1 MPG.

If the two calculations were way off by more than 2 MPGs...then I'd use my actual AVG MPG...not the highest MPG that I recorded to use in the correction equation {VK= actual MPG/displayed MPG) x 1000}.