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That's what I'm seeing. The MID numbers always display the MPG's that are 5% higher than my calculations. I doubt if Toyota will make any...
The air gap in the top of the tank is called ullage. It's designed into the tank to allow for thermal expansion.
I've been lurking here for several months and have found it to be interesting. I picked up my Gen III July 2nd and have rolled up 4500 miles so...