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 - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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