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  • Fuel science “good news” depends on what you drive. Non-performance Engines (yes even your V8, it only revs to 7k) made after 1985 generally have the design to handle “87”/low quality fuel and, all else maintained well, will still get you hundreds of thousands of miles from the engine - if anyone tells you otherwise they are selling you gas or guzzle marketing koolaid. When the engine compression numbers rise, along with the redline (engine speed), that’s when it gets more serious to put in what “the manufacturers” recommend (crazy, they are in bed with fuel producers! Who would have thought?!). Many also believe to “pamper” the whole car when new for a few thousand miles to allow everything to heat/settle correctly.

    Obvioulsy, actual race cars (no, your off-dealership-floor sports car, even with 700hp, is not a competitive race car - unless you bought Mazda’s caged FIA Miata) have a specific fuel mix the engine is designed for so they must fuel with that exact fuel.

    So, if you’re “moving down” on an M/AMG/RS/Z06/Roush/etc you’ve been driving for a while, you’ll be fine and save some money, even do yourself a favor and stay there unless you psychologically feel like the higher octane is “doing something” (actually it’s just the ECU leaning out fuel “consumption” a tick for the power you ask because it sensed more efficient fuel - which studies have shown reduce mpg IRL because ppl then just develop a heavier foot). Your contemporary performance cars will be fine... until you put in a tune/mod on it and push the engine parameters “out” of what it was designed for, then fuel/oil quality becomes exponentially important.

      2 years ago
    • Wow! 7k rpms in a V8. Great advice there Daniel!

        2 years ago
    • How high an engine will rev doesn't have anything to do with ignition phase and/or compression. If manufacturer specifies a "high" octane as required rather than recommended - it is indeed required.

        2 years ago
  • I use whatever is required for my BMW which is Premium no matter the price. Same with my V8 IROC Camaro.

      2 years ago
    • Is that white Iroc in your posts yours?

        2 years ago
    • I suspect that ethenol is not great for that old v8 engine either?

        2 years ago
  • You are paying for all the bicycle lanes that cyclists don't pay for...

    Here in SC it is currently $2.28 for a gallon. :D

      2 years ago
    • And for roads that aren’t fixed 😫 CALIFORNIA IS SO WONDERFUL!!

        2 years ago
    • I haven't driven in California, but New York City "roads" are like off-roading. I bought a new car hoping it would survive the few months before I moved. It didn't. It's dangerous on a motorcycle, this in a city promoting bicycles.

        2 years ago
  • Since my engine is heavily tuned to specifically maximize power output on 91, I have to use at least that with no exceptions (unless I map my engine back to the stock mapping).

      2 years ago
  • I usually run 93, but when it gets to $3 a gallon, I’ll go down one level

      2 years ago
    • Good morning Natalia! That sounds like you move to 91. Is there any price that you would force your car to drink the muddy swamp water of 87 octane?

        2 years ago
    • We have 85, 89, and 93 here. I’d never use 85

        2 years ago

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