This is obviously not an ADV bike but is certainly something different in the development of alternative fuel motorcycles. This dual fuel petrol/CNG machine has just been announced by Indian manufacturer Bajaj.
The Bajaj Freedom is only 125cc so only produces 9.4 bhp at 8,000 and 9.7 Nm of torque, even this is around 2-2.5 bhp less than Indian domestic market petrol powered 125cc motorcycles typically produce.
Outwardly the bike looks no different to any other bike, but under the seat a CNG tank is contained between the rails of the trellis frame. Bajaj claim the 2 litre petrol tank and 2 KG CNG tank give a combined range of 330 km, with 213km of that from the CNG tank and 117km from the petrol. Fuel delivery is by fuel injection and switching between fuels is done by a push button on the left handlebar controls.

Obviously sitting on a pressurised container of gas would be concerning and extensive safety testing has been carried by Bajaj, including by driving over bikes using heavily loaded trucks to ensure the CNG tanks won’t explode in case of an accident.
This video is all in Indian but gives you a quick look at the bike.
https://youtu.be/KRXcSY80LIk

