[Jackpine]

Originally Posted by bossman15

I'm trying to figure out my mpg difference with my gryphon and then when i get my custom tunes but i dont know what mpg to go by. The gryphon has it at 15.2 right now but my lariat message center has it at 13.2. I just dont know which to believe. I've heard the stock one can be off at times and the fact that the gryphon is plugged directly in the obd port leads me to believe its a little more accurate but i dont know. any body know which is more accurate straight off so i dont have to compute it the old fashion way?

Bossman, I'm going to move your thread into the Gryphon section, because it doesn't really seem you have a problem that Bill or Corey needs to deal with.

I have a message center in my truck too, and I've always found the Gryphon seems to be higher, and less accurate than my message center's readout. I think the message center uses a smaller number of samples than the Gryphon. Bill says the Gryphon uses 100,000 readings for its average, and I seem to recall they are about 1 second apart. This works out to an average over about four tankfuls of gas, and I know the message center changes more rapidly/frequently than the Gryphon, so I'm certain the sample size is smaller.

It doesn't really explain why they should be different, or why the Gryphon should read high for you and me, but I DO think the effect of the smaller sample size is to make the message center average mpg closer to what you are currently getting, as opposed to over a month's period (if you fill up once a week).

Regardless, once you determine the normal error, it seems to be pretty consistent. You could just use the Gryphon's reading and subtract the error.

- Jack