Originally Posted by mcbrew
Unless you've done an engine swap, an xD doesn't have a VVTLi engine. We have VVTi -- no valve lift adjutment. Yes, there is a VVTLi version of this engine available... for instance, in the Lotus Elise.
Our engines have nowhere near the compression that requires or gains any benefit from premium gas. Regular gas ignites easier, and is what most engines are designed for. Engines with higher compression use premium and usually produce more horsepower... but it is due to the engine, not the gas. Premium gas is used ONLY to eliminate preignition (knocking) in high compression engines.
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Interesting; I read a piece on Spitfire Fighters in WWII. A great fighter but needed more climb to go head to head with the Me109. The US started supplying fuel at 100 octane rather than 89 which improved the HP of the Spitfire and gave the pilots a little edge in the Battle for Britain. I have put racing fuel in my Hyundai before and noticed a significant increase in power.