Dear bro. I had Exi Prosmatec 2005 with CNG my experience is very good.. its true pick reduces, but very economical on long route. I suggest if you want peace of mind go for prosmatec. I used to go to Islamabad from Lahore. My car covered arround 220 Km in 335 rupees with A/C. I installed 60 Kg tank. If you go on long route occationally go for 55 Kg tank.. this would be better because of less weight.