It kind of depends on whether your fusion engine consumes gas or hydrogen 
On a more serious note: some cars have 'heavy' oil for the break in period and get more economical when that gets changed to regular oil. Maybe yours is one of them.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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