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The recent stories about direct injection engines not withstanding, I've never seen any real data that compares cars run solely on Tier 1 gas vs. those that are run solely on non-Tier 1 gas. Does anyone have any data that supports the claims that Tier 1 gas is better for you car?
All I have in anecdotal evidence, which is that I ran my E46 M3 for 125,000 miles filling it up with whatever was convenient, and I never had a single engine problem and never had any performance decrease (in fact if anything it got faster over time). Not only that but my mechanic (private shop) said the motor was in good shape and appeared well cared for. Like I said, this is just my own experience though. I'd really love to see some real data on this.
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