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 - Stories From Old Farmer - by K. Pratt. Old Farmer, a.k.a. Dale Jensen began posting messages to our discussion forums at the grand age of 75. With extensive knowledge of farming and tractors, he valued the past and the ways that went with it. He shared these values with us until shortly before his passing. I spoke with Dale in his last days and requested his permission to share some of his stories with the readers of our magazine. He agreed, and provided the
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