Both mini & Terios Kid with 660cc engine & turbo are not good in cng. Consumption of Terios Kid is better thn mini. As both the SUVs' were in my use so I hv idea of both
after converting Terios Kid engine from 660 to 1000cc it become a perfct 5door SUV, excellent in pick, fuel consumption on CNG, velocity & so on.. In 40 size cylinder it use to gve 120plus in local & on motor way it easily touches 120-130. Spare part is much xpensive & hard to find
Coming to mini. Its excellent SUV in 4.5 to 5 lacs range but if its 1100cc with differntials of Pajero Junior. Its heavy in fuel as compared to Terios. Mine was 1100cc with 40 size cylinder & it use to gve 95-100 km in one tank. Maximum speed was not more thn 100-105. Spare parts easily available @ cheap price. Much much rough & tough thn Terios kid
So brother this was my experience...