I wonder the same thing, I never paid attention until just a few weeks ago when I heard it come on and then kick off as I was thinking about how to make my car use less fuel....thinking,,,,,thinking,,,,thinking.....wait , I just wasted a quart of fuel oil at 3 bucks a gallon
This scenarior doesn't fit the other potential problems outlined in that article, so I'll go after the low hanging fruit first. Heater does need a tune up thou....