Well it seems na ang cause ng overheat ay dapat na pala palitan ang water pump ng kotse ko. May petron blaze pa naman so tiis na lang sa mahal ng presyo total pang city driving lang naman. According to wiki... "A fuel with a higher octane rating is less prone to auto-ignition and can withstand a greater rise in temperature during the compression stroke of an internal combustion engine without auto-igniting, thus allowing more power to be extracted from the Otto-Cycle." Besides pag wala na talagang choice at gusto mo pang pakinabangan ang lancer itog mo eh pa convert ko na lang sa lpg. Kaso lang baka ibang problema na naman. Mahirap kasi iyong suggestion na you cannot leave your car with unleaded fuel for a week kasi usually weekend ko lang talaga ginagamit. Pero thanks anyway sa mga information kasi it helps a lot.