I got a pretty easy 70 MPG US round trip, over 180 km yesterday. 12 C / 54 F.
That's with DWL on the back roads/scenic route, at a cruising target speed of ~75 km/h in order to compare the Metro's MPG against the Prius Prime's ICE-only MPG on the same route at similar speeds.
Outcome:
The Prius won, and did it in wet weather vs. dry for the Metro.
The Metro's summer tires are back on (RE92's), plus it recently got a fresh oil change and a cleaned up distributor cap & rotor (electrodes were getting pretty carbon-y). I should check the spark plugs.