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A lot of new cars have turbos due to downsizing of displacement. So I think fuel retailers are aware of that fact.
However since you are lone customer, you can't really dictate what the retailer sells. Even from day to day there are variables due to the underground tank moisture, temperature etc.
If you really want to get the absolute most out of the fuel, the only way is to go the expensive route and buy the fuel in bulk, sample it and make your own special brew, ie by adding required amount of octane boosters based on the sample result.
Most people don't have the space to do that.. so I would suggest is get a sample (or better several samples from different days) of your fuel analysed.. and tuned to the limit for that sample.
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