Good Day!

Were thingking of having an Innova but were still not decided on what to get. We intend to use it as long as it could serve us..just like our 20 year old corolla....obviously if we are to look at the fuel consumption....diesel will definitely be a good choice ( better FC and diesel fuel is cheaper than gas) but i we are to look in the Maintenance cost (Gas will be a better choice because of maintenance cost and parts)....my father owns a 2003 toyota revo GLX (1.8 efi gas engine) it has already drove morethan 130,000kms and still no problems encountered especially in its engine......i need your advice please.