Hi everyone...
I drive an 2009 Aveo 1.2LS (1.206ccm/73,59cui; 62/60kw (fuel/LPG)) 2-door hatchback (german model) with a BRC "Sequent Plug&Drive" LPG-system (dealer-installed before delivery).
Whilst running on 98-octane fuel I get those mileages:
city: 32-34mpg / 7-8L/100km
overland (many hills): 36-39mpg / 6-6.5L/100km
highway (at ~75mph - 120km/h): 42-44mpg / 5.3-5.6L/km
The mileage whilst running on LPG is lower but LPG costs less than half per litre:
city: 24-27mpg / 8.5-10L/100km
overland (many hills): 32-34mpg / 7-8L/100km
highway (at ~75mph - 120km/h): 33-36mpg / 6.5-7L/km
All those mileages were done without using the A/C, running the A/C lowers the mileage (approx. minus 3mpg / plus 1-1.5L/100km).
I hope this helps for the mileage statistics.
Greeting,
Nautikuus