@autophile
well dude if u dont mind ....it seems like u are convincing urself to continue running the car on Petrol.......i also was against CNG..but ever since i insatlled it...my fuel bill has gone down ....Rs 2 / km....is simply grt.....i mean u fill the cng worth 200 rupee and get 100 km without ac and 85 km with ac...that too within the city((when on petrol..i believe at least i by my self feel ashamed to ask the petrol guy to fill the petrol worth 200 rupee!!! even if i do fill petrol woth 200...i wont get more than 40 km of mileage))).............
as far as the trunk space is considered....u may ask urself..how often u utilize the FULL trunk space...rarely i guess....for normal use..enough trunk space is available even after the installation of CNG cylinder.........as far as trips to work shop are considered.....well...i think there is no harm in visiting the work shop once a month....its not a big deal....,...
so my sincere advice to you is to take a step on switch to CNG....petrol is too expensive......driving pleasure is lost on cng.....but...economy does matter..!!!!!!