Yes, gasoline direct injection engines are pretty dirty in the intake ports and on the intake valves because they don't see fuel spray anymore. They still benefit greatly from top tier fuel though. Their injectors have much smaller orifices and tolerances than standard fuel injection. They also have a high pressure fuel pump (injector pump) that increases pressures to 2-3000 PSI that needs to stay clean. Top Tier fuel will definitely help keep these parts clean but it will not keep the intake ports or valves clean.
I think it might be worth spending a few pennies more per gallon for top tier fuel. I only hope we are getting what we are paying for though. With today's engines and technology, fuels and oils are becoming a lot more critical on using quality products to keep them alive and healthy.
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Today's Featured Article - The Collection of a Lifetime - by Sherry Schaefer. The larest gathering of orphan tractors ever assembled by one collector will be auctioned off on May 15 in Rock Island, IL. Ed Spiess was a well known tractor buff who spent most of his time dreaming of rare and unknown tractors. His background as an agricultural engineer sparked his interest in the unique attributes of the models built from 1939-1959.
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