u/Centrifea

For context my and my colleagues does 70% highway 30% city commute.
These are some of our bikes roughly real world data. But of course we live different places. But mostly highway. And fuel costs are sky high now.

Yamaha Mt10 6.4L/100km
Yamaha Mt09 4.8L/100km
Yamaha R6 6.3L/100km
Yamaha R3 4.2L/100km
Honda Cbr600 5.8L/100km
Honda Cb400 5.2L/100km
Honda Rebel 500 3.8L/100km
Honda Cb150r 3L/100km
Kawasaki zx6r 6.4L/100km
Kawasaki ninja 1000 6.2L/100km
Triumph 765 5.3L/100km
BMW GS1250 5.2L/100km
BMW S1000RR 6.4L/100km

For reference bread&butter commuter cars
Mazda 3 6.5L/100km
Honda Vezel hybrid 5L/100km

Genuinely curious, motorcycle are much more lighter. Why do they have similar fuel economy to cars.