I am still in the first tank and it was filled by the dealership. They said it is octane 93.
But I see my mileage is increasing slowly. After driving for 100 miles it reached to 16MPG.
I recently got a mustang ecoboost hpp and drove for around 40 miles. the mileage I got was 13MPG. So is it normal for a new mustang to have low mileage during break in period or should I contact the dealership regarding this. Can anyone share any insights on break in period as this is my first car.