We’ve been putting on quite a few test drive miles in combined city/highway driving mode. The improvement with the new motor has been astounding! It now has the power to completely move the vehicle down level grades at 50+ mph (i.e. the gas engine idles while the electric motor does all the hard work). This has allowed us to see results of over 40 mpg as verified by both actual gas consumption and the onboard fuel efficiency gauge. We’ve found that the onboard gauge generally registers a bit higher fuel efficiency than reality in gas-mode only and shows a low reading with the hybrid system active.
A view while driving showing the mpg’s pegged at 99.9 mpg as the electric motor completely powers the truck down the highway at 50+ mph 
The amazing benefits for combined city/highway driving of over 40 mpg