Trying Soltron
Called around to Napa stores. There warehouses have it and I found one store nearby that actually had some so I am trying in 2 diesels and 2 gassers. Have no opinion yet. Must resist any mental bias and try to assess it as just another additive to spend on the usual trial and error madness. But their website helped motivate me. It calls for 1oz per 30 gals. so it is reasonable.