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The knock sensors will hear any 'pinging' long before your ears can, and when that happens: The mixture gets enriched and the timing retarded, resulting in poor gas mileage and soot coated O2 sensors. Typically, the 'regular' gasoline does not contain any cleaner additives, which help keep the injectors and valve seats clean.
The turbo is more suited to use 87 octane because of the lower compression ratio, BUT, the low pressure turbo comes on at about 1500 rpm and raises the ratio to over 10.5:1.
The normally aspirated engine has a ratio of about 10:1 which requires 'premium' gasoline.
Many have found that if they drive nicely, meaning gentle accelleration and without long hills, the 89 octane works for them. But do not go over 4500 rpm, because the extra heat will cause pinging.
The differencee in price is 10 cents/gallon between each grade. For an 18 gallon tank, that is $1.80 or $3.60 for a tank that will take you close to 500 miles. Less than one cup of Starbucks! Be kind to your car and use the grade that will keep the engine clean and efficient.
Klaus
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Always willing to listen, just not able to take direction.
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