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Originally Posted by TLgunner
On a Type-S, the engine computer can compensate (retard timing) for the lower octane (depending on load, altitude, etc.) and you may not hear any pinging. However, the Type-S runs very high compression and so it'll be prone to pinging with lower octane fuel. Many Type-S owners who've tried lower octane fuel also report reduced fuel mileage and less power. If conditions are bad and the pinging severe, engine damage will occur.
Bottom line: The engine is designed to run on high octane fuel so it'll run best on high octane fuel.
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We have a 2003 Tl Type s and put in 87.. No pinging, reduced fule MPG, or performance. Every now and then we will fill it with Mid...
