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^ I think you seem to be forgetting that D4-S is coming from the world leader in car reliabiliy.
Not only that, D4-S combines Direct and Port injection, so you won't have the carbon buildup problem on the intake valves like purely Direct Injection engines have.
You said it yourself - Honda have had NO reported problems with it's VTEC system, and that goes to show that car's are getting more and more reliable as time goes on (as you'd expect - power, fuel consumption, reliability and saftey will all increase with technology). Chances are Toyota (or any high-volum manufacturer) wouldn't add these sorts of things if they knew/expected them to decrease the reliability.
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