If it helps, Chevron gas is said to have about 400ppm of PEA (Techron) in it, they say the complete fuel system cleaner is about 10x that concentration so about 4000ppm when used in at the recommended dose. The only gumout product I have any idea on pea content is the multi system tune up where the SDS specifies there is 5-10% pea but ays that there are 9.63% of the composition is of unknown toxicity which leaves me to believe there is around 1.5oz of PEA. The Gumout high mileage fuel system cleaner with regaine says something like 20-30% PEA on it so in a 6oz bottle there's like 1.2-1.8oz of PEA. Redline SI-1 has about the same concentration as Techron. Redline recommends using one 15oz bottle to treat upto 20oz when used as an immediate fuel system cleaner. The old whitepaper for SI mentioned using 15oz per 100gal as a maintenance dose, so around 1.5oz per 10gal, so if we consider that the concentration of PEA is roughly equal to Techron which when used at 1oz/gallon leaves a concentration of ~4000ppm of PEA so using 0.15oz/gallon would leave a concetration of like 600ppm which is about 1.5x what you'd expect to find in top tier gas. Anymore I don't think maintenance dosages really mean anything if you use top tier gas since I assume that the newer top tier gas has a lot more detergent than fuel did back in the early 2000s when Pedline used to recommend a maintenance doseage, plus most cars are GDI now and you don't get the intake valve cleaning action since the fuel doesn't contact the back of the valves although running a large dose every 1500-3000mi as recommended by most fuel additive manufacturers should help keep the injectors clean and may help reduce build up on O2 sensors and catalytic converters.