ElI5, does filling up Supreme gas give you more milage then regular and is it significant?
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It depends on whether or not your car was designed to use premium gas.
The modern North American market Fiat 500 (with the 1.4 MultiAir engine) is a good example of this. It is a relatively “normal” car, i.e. not a sports car – it’s just for getting around. But it *is* designed to use premium fuel – this lets it use a higher compression ratio to get more energy out of the same amount of gas. You can use regular gas, but the range of the car decreases. In order for it to run ok on regular gas, it has to significantly retard the ignition timing – this is not ideal for efficiency.
A different car (say, a Toyota Yaris with a 1.5 NZFE) would be designed with a lower compression ratio, to get the most out of regular gas. Since the compression ratio is fixed, it doesn’t get anything extra if you put premium gas into it.
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