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In the summer, for DD, I average around 34-35. In this polar vortex nonsense I'm right around 30-31. Hand calculated.
I also noticed the mpg display is optimistic by a good 1-2 mpg. Consistently.
I actually calibrate the odometer - I'll run 50 miles on marked highway/interstate and compare that to the odo and see how far off it is. This helps account for different tire sizes. I've found the stock calibration isn't far off but there is a difference with different tire sizes (225/45-17) - not a lot, but if you're being anal about it it can shift the numbers a bit.
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