The Top Tier fuel program was developed by auto mfgs, to guarantee a standard min fuel for their cars. Although the mfg don't require the car to use Top Tier, they certainly endorse it.
Both AAA and Consumer Reports endorse the use of Top Tier for those cars which it was developed. I don't think it is limited to a marketing hype, similar to STP back in the 60s. STP did nothing for cars lubrication, and in a few cases caused problems for some engines which were prone to sludge generation. Top Tier fuel additive package is designed to reduce carbon deposits.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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