2007' Opel Vectra

I am selling an Opel Vectra with a new stag 400 gas installation which cost PLN 2,700 with a capacity of 1.8 140 km. The car was imported from England and was allowed for right-hand traffic after replacing some elements.
the car burns gas on the route 7 liters on average 8.
-insured until August 2022.
I am waiting for a different proposal, the possibility of leaving something else in the settlement [may be damaged].