OK; I definately, no doubt about it, positively get better gas milage on the hyway with the windws closed and air on. Stop and go driving is just the opposite. As far as oil change intervals, suppose your driving was limited to all short trips. What can burn off? And then how many months, years or decades would it take to reach that 13000 miles? There are just too many variables.


Over the hill but still climbing.
88 Montero 2.6L auto, manual hubs, cooling fan conversion gps,recurved distributor,LSD Diff.