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Are you saying a side benefits to an IMSR bearing is it will/maybe/a tad improve mileage?
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It can.
The reason being the reduced friction which directly impacts the engine's efficiency.
Not all cars are the same, actually none are the same and the same applies to drivers of the cars. We've seen some cars pick up 3MPG, others haven't picked up any and some people never even noticed a difference because MPG doesn't matter to them.
Lots more can impact MPG other than a bearing retrofit, especially the engine's state of tune, condition of the MAF sensor, etc, etc.
I do not formally advertise better MPG with the retrofit because it doesn't happen in enough instances, nor does it happen in a great enough scale to be noted.