Hello,
There are obviously a lot of options on the market. I sell fuel additives for a company but won't mention who for the sake of the conversation. HPCR systems are much more susceptible to carbonaceous (external) and carboxylate (internal), making an additive package that can properly clean...
Top Tier contains additional detergent additive above what is required by the EPA. It equals about 3x the LAC level of detergent. BP recently (within 12 mo.) dropped Top Tier because they believed their Invigorate fuel outperformed Top Tier. Which it probably does.
SeaFoam contains up to 25% alcohol in it (from their safety data sheet). I don't put anything with alcohol in my engines since that voids warranties. Do you know something I don't about the warranties and why that wouldn't void it?