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Taylor95, 22mpg is very good. Your getting 3mpg better economy than what was reported for a new one.
The additives i put in the XJ diffs and transfer case contain PTFE friction modifiers. I use it to reduce friction and make things run smoother.
My engine has done 201,000 miles (325,000 kilometers). It was starting to sound a little mechanical with very mild lifter noise. The additive has just quietened it down and made it run smoother. Sounds more like a sewing machine now.
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