yup pansin ko to. sa 1.1L at 1.6L gas cars, may difference talaga sa mileage (mga 1-2 kpl normal driving). pero sa 2.7L na diesel, parang wala. same ang mileage kahit on or off.
my van has a 2.7 and honey, when the a/c off i get 9.5km/li. a/c on and i get 11km/li. city driving that is. the best eco run i have with a/c on is 14km/li. forget those sprinting starts and screeching halts.