Quote:
Originally Posted by My Caroline
I'll put it this way, math doesn't lie. When the math is different than the DIC, I'll trust the math. Of course when I first got the car I let the DIC run the whole tank. I, like the OP as concerned that my MPG was low because of what the DIC was telling me. So I calculated it with math and found that th DIC was in fact low.
I have noticed that the DIC is 5-8 miles per gallon LOWER than what the math says. I have noticed my MPG DOES NOT run the entire tank. It stops averaging. If I drive half a tank at 15 mpg and the last half on he highway getting 30 the AVERAGE should be in the 20s (about 22), not 15. And my math has proven this to me.
Your DIC and math will be close if you drive the whole tank out in a trip. But if you're like me and take a week or two to empty the tank it just isn't right.
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Sorry you are still wrong. It dosen't work the way you describe. What makes you think it stops averaging when you shut off the car? Does it reset on its own back to 0 when you first get in the car and start it? if its reading 18mpg when you shut it off. As soon as you restart it it should still read 18. Like I have said I have owned several cars with this feature and if yours is doing as you describe then you have a problem. It does not matter if you are on a trip or it takes two weeks to run out a tank. It should be close.
By the way how can you tell your getting 15 mpg for half a tank and 30 for the second half? If you reset your DIC at half a tank on the gauge (which at half a tank indicated you may have used more or less than a half tank) do you run it to completely empty? How do you know how much gas you used for the first half a tank? How do you know how much you used on the second half? You cannot figure it out the way you say. The math won't work out. There is just to much error by GUESSING how much gas you have used in each half tank.