Sorry, to clarify: my guess is that the petrol is being diluted with diesel. That would work better than most other adulterants, and it would also explain a drop in measured octane. I dd specifically mean octane; you can measure diesel’s octane and it is very low, it’s just not relevant in normal usage because diesel engines ignite their fuel differently to petrol ones
Diesel is rated by cetane, not octane, and the cetane numbers are lower. There’s nowhere that diesel would have a cetane pump rating of 92.
That’s certainly gasoline.
Sorry, to clarify: my guess is that the petrol is being diluted with diesel. That would work better than most other adulterants, and it would also explain a drop in measured octane. I dd specifically mean octane; you can measure diesel’s octane and it is very low, it’s just not relevant in normal usage because diesel engines ignite their fuel differently to petrol ones
Ohhhhhhhh yeah that makes sense!