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I don't know if this topic has already been hashed over, so thought that I might bring it up for those who are looking for lower parasitic losses from their engine. Over the last few years major vehicle manufacturing engineers have been developing more efficient engine oil pumps, it seems that most engines have way over engineered oiling systems which results in unnecessary power wastage. There is at least one easy gain to be made by fitting a bypass oil filter to your car's oiling system. The small reduction in engine oil pressure experienced when using a bypass filter means less power is required to drive the oil pump, and cleaner engine oil along with possible extended oil/filter changes is a bonus! Of course there is always the risk of engine damage if the oil pressure gets too low, like when you're at full throttle pulling 6000 revs,(or full throttle at 1000 revs), but if you are driving for mileage then the risk factor goes down somewhat. I have ran a "Jackmaster" bypass filter on a previous vehicle, and kept the bypass filter when I changed vehicles a couple of years ago, even though I haven't got around to mounting it on my present suv yet. I might run 2 bypass filters in parallel, but first I want to set up a 12 volt solenoid cutout on the pressure side of the bypass filter so that the bypass is only active at light throttle settings where lower oil pressure won't cause any engine problems.