Remember drawbacks if u use cng in gli, u have to put pads in rear shocks to bear weight of cylinder 24/7. Ruining, urs car ride and cornering ability by added weight and stiff rear shocks. Shocks will wear out earlier. You will have to fit auto kit in gli which has emultor, still emulator will faile a lot of times, if u are lucky enough to get it hooked up correctly i.e. FIND A GOOD CNG MECHANIG FOR INSTALLATION. Almost all the cng filling stations in Pk are of low quality, their lubricating oil comes with the cng, it accumulates in the cylinder and then to the kit and finally in the eninge where it will, block valves, create extra residue on ring and pistons and also reducing the capability of spark plugs to ignite fuel. Thus remarkably shortening engine life. Moreover service interval will be shortened as cng need cleaner air filter and more healthy plugs as compared to petrol. If u must use CNG then i recommend go for baleeno, otherwise city is a good choice in 1.3 cars because of it amzaing consumption. Moreover it is much better than toyota in terms of technology, i.e. EPS (electronic power steering) giving u more control and reducing consumption. CVT in vario further reducing consumption. IDSI, twice the BANG for the buck, i.e double spark. Moreover top of the line city vario costs even less than xli. However if ur prefrance is only resale value go for toyota