I'm going by Miles per tank, I reset the meter every fill-up. My speedo is adjusted to my tire size as well.dont go only by the lie o meter, hand calculate for bet results.
Also, if you have larger tires, and your speedo isn't adjusted, make sure you compensate for miles shown vs. actual miles driven, prior to figuring MPG
This is correct. And it is not something new by sct. I loaded up the most current software when i installed my sct back in the beginning of june. I set my tiresize up and found my shift points were delayed and my speed was out by 10% compared to my indash gps. I reloaded it a few times reducing my tire size and got closer but not quite there until I realized that I had to keep it as stock tire size because the dealership had recalibrated my truck with 35" tires as stock.I have a GPS that tells me my speed, and the speedo is correct. The SCT does correct the speedo