Cars Q&A

Hi Experts & Car Owners Two Queries : 1) I heard that GM is again comigup with Matiz, its true?? If yes, then majority of people says that Spark is same as Matiz. Then whats the difference in two models?? 2) If one opts for CNG/LPG version, then in summer ( i.e temp.around 47-48deg)are there any chances that these gas running cars takes fire automatically due to heat?? Pl confirm Regards Shekhar