hmm im guilty of this one.

but not in the sense of adding more km to my mileage..but to mix the fuel that is remaining in the tank with the new one..i dont do it often, just at the start of the flow of the gas to the tank. i get a full tank kasi pag kalahati na yung gauge indicator eh..i dont use up all the fuel..ayaw ng dad ko kasi baka daw mmya may emergency then paano na daw kung ubos na yung gas..and what if kung may pupuntahan pang unexpected places...hassle. so we get a full tank pag half na.