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and still just 53 mpg av. over 175 miles...

Fifteen minutes out of Five hours is not going to make a big difference.
That is a good run though. I have not had a run like you. This shows a lot of good judgment and driving shills.
Congratulations.

PS Had you reset the trip before this run, it would have perhaps shown the 100mpg

Good Job Dave!

15 minutes of going mostly downhill and at 30 mph or less, two years ago ;-) And just last week, I filled the 15 minutes again with another 100mpg+. It happens every now and then. Only the first time its real special - like watching 100,000 miles/kilometers roll over on the "dial."
BTW, I reset Trip B only at fill-ups. Trip A is for life of the car mileage info. If anyone ever resets that one, even by accident, they're in big trouble. I wonder what will happen if the 12v battery is ever disconnected? Lose the recorded info?