Mixing 90 & 95 Octane.

[SimpleAuto]

Well, this might sound dumb  but if you mix the aforesaid together, will you get something in between or the molecular structure of 90 is completely different that of 95 and will have an adverse impact on an engine which recommends 92 octane for say.

Thanks in advance.

[kush]

No issues, mixed petrol will have the average octane. i.e 50:50 will have a octane rating of 92.5

But remember the octane 90 or 95 is also an average rating, 90 octane might be in the range of say 87-92 and 95, 92-97.

[rameez]

No issues, mixed petrol will have the average octane. i.e 50:50 will have a octane rating of 92.5

But remember the octane 90 or 95 is also an average rating, 90 octane might be in the range of say 87-92 and 95, 92-97.

how about the perfomance of the engine.....say 5 litres of each....in the tank....

[kush]

I have run my cars with 90 & 95 (Corolla 141, Lancer Ex 1.5, Suzuki Swift 1.2) and have not seen a significant difference in performance or economy although technically there could be a difference.

Most of the modern car ECU and adjust the ignition to compensate the knocking. However some Euro cars are designed for 98 octane so they may not be able handle 90 octane.