[Kacper Pawlowski]

Last time I tested my passat GTE I averaged around 7l/100km (33mpg) on a motorway at 120kmh (75mph) with semi charged battery. My 500km+ trip averaged around 6.4l/100km (37mpg)

 

[Kacper Pawlowski]

I think maybe you've used American gallons there. 7l/100km is about 40mpg (UK gallons) and 6.4l/100km is about 44mpg (UK).

Woops!

Then my long-term consumption is 80mpg.