ORIGINAL: downunder

Which isn't actually what I said and that's why I used the simplest possible fuel (just oil and methanol) as an example. That engine runs only on the methanol part of the fuel mix regardless of oil quantity so the flow of methanol must remain constant. IOW, the engine runs on 100% methanol, the oil is along for the ride . Same applies if the fuel part of the mix is methanol/nitro.

The problem is that everyone's so used to reading contents of fuel with oil included that they forget what the content of the actual fuel is. Let's say you read the contents as 20% oil, 40% nitro and 40% methanol. Oil isn't a fuel but the rest is so what your actual fuel is in that jug is a blend of equal parts methanol/nitro or, in fact, 50% nitro and 50% methanol and the fuel part will remain as 50% nitro no matter how much oil you add.