Gary has a very good point about the IDS mode. High octane or “premium” fuel helps in two ways: the added octane allows the ECU to maximize spark advance, which extends the burn time on the power stroke, making more power. This is continuously monitored for optimal operation with the knock sensors giving feedback to the ECU when spark advance is too far ahead. The second thing is the additive packages tend to produce fewer residues and deposits in the fuel system, important for direct injection, which tends to require more injector maintenance. Other factors could include worn or fouled spark plugs, clogged air filter and burnt or worn automatic transmission fluid - hint - if you haven’t changed it, do two or three fluid changes separated by a week or so I’d driving, and you’ll have most (~90%) of the old fluid replaced.