> mid grade gas is just premium and regular gas that is gets mixed
There is nothing else "premium" about premium gas, than that it can be compressed more in the engine. Compressibility is measured by the octane rating, so it makes sense than mixing 87 octane gas and 91 octane gas, gives you 89 octane gas (using the American octane scale, Europe uses a different scale).
There is nothing else "premium" about premium gas, than that it can be compressed more in the engine. Compressibility is measured by the octane rating, so it makes sense than mixing 87 octane gas and 91 octane gas, gives you 89 octane gas (using the American octane scale, Europe uses a different scale).