Originally Posted By: surfstar. It is true that some gas stations (the majority around here) only have 2 tanks and blend at the dispenser, so yes, you can blend your own and get mid-grade. 89 is 66% 87 octane & 334% 93 octane. That means that it's exactly proportional, so 50% 87 + 50% 93 should equal 90 octane.. If your vehicle is compatible with E10 petrol, there's no reason you can't mix the 2 grades of petrol (E5 97+ and E10 95+). It's perfectly safe to mix them in the same tank or fill up with.

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E10 is 10% Ethanol 90% petrol. By adding E10 to a tank with petrol already in it you are basically slowly increasing the amount of ethanol in the mix. As your vehicle lists itself as E10 compatible, I don't see how there would be any harm using a mix somewhere between E0 and E10. Modern vehicles with fuel injection and engine computers will.. E10 is generally slightly cheaper than regular 91 petrol but that price difference can change and varies from state to state, and between regional and metropolitan areas. E10 does have a 3% lower energy content than 91, so you may find that you'll use slightly more fuel to travel the same distance, says the Royal Automobile Club of Queensland.