63 MPG US = 3.7 L/100 km
That's calculated at the pump (3 clicks) over 566 km / 352 miles.
Interestingly, for the first time ever, a car's factory economy gauge was slightly
pessimistic (showing 3.8) vs. the calcs!
I'm quite happy with that, considering I only starting adding ecomods to the car part-way through this tank. And I did hardly any engine-off coasting. Most of that driving is highway (80 km/h = 50 mph max limit) on cruise control, tapping up & down for hills, traffic permitting.
On top of all that, it included a ~120 km trip like this: