An unexpected reset

Odometer: 2844.4
Tank Mileage: 608.9
Gallons Added: 15.578
Long-Term Average: 40.5 (reset during tank)
Short-Term Average: 40.5 (reset during tank)
Calculated Average: 39.1

I will need to figure out how I'm going to calculate, and report, long-term average mileage. One of the sites I'm recording my mileage on reports my overall average as 37.7 mpg.

Between the time we parked to go to lunch and the time I started the car after lunch, several items were reset: short-term average, long-term average, the dash display settings, and the fuel efficiency display settings. Trip A and Trip B were not reset. I have no idea what triggered this reset and no operational impact has been noted, but it is annoying.

I had 10 miles to E showing when I stopped. I already knew the low-fuel warning activated at 50 miles to E. This is accompanied by an alert tone. This tone is repeated at 25 and 10 miles to E. One thing that will make me feel better is that I drove more than 40 miles after the 50-mile warning. Fuel remaining goes down quickly from 1/4 to the low-fuel warning, but the slope appears better after that point.

On the way to Toronto

Odometer: 1170.2
Tank Mileage: 492.3
Gallons Added: 12.582
Long-Term Average: 33.3
Monthly Average: 38.1
Calculated Average: 39.1

We filled up a bit early to avoid having to buy gas in Canada. We should easily be able to get back to the US before we have to fill again. We had 148 miles to E for an estimated tank range of 640 miles. Long-Term average is now over 30 mpg. The Monthly average did get to 38.5 during the week while commuting.

As mentioned after the first tank, this tank included about 200 miles of Interstate driving with a significant tailwind. The two legs involved included a 44.0 and a 43.6 mpg segment average.

Per the Owner's Manual, we are now out of the break-in period. Based on statements made about the Ford Hybrid system, I should see some improvements over the next few thousand miles as the rest of the system wears-in.

First fill-up

Odometer: 677.9
Tank Mileage: 526.8
Gallons Added: 14.974
Long-Term Average: 29.7
Monthly Average: 36.6
Calculated Average: 35.2

I had to drive to Dayton, Ohio today. I spent most of the 200 miles driving into a quartering headwind. As I neared Dayton, the was a bong and the left-most part of the instrument panel changed to a Low Fuel Warning. This was apparently triggered when the Miles to E hit 50 miles. I filled with 30 Miles to E for a Full Tank Range of 556 miles. When I turned the car on after filling, there were 551 miles to E.

This is quite encouraging. I will be done with the break-in period of 1000 miles when I next fill the car. I had a significant tailwind on the return trip. Both segments of the trip home showed over 40 mpg. We'll have to wait for the next fill to see the full impact.