In terms of performance... I used to drive a VW Golf. Premium(90 or 91+) was recommended for the car. I tried tons of gas types in there (performance-wise)... domo, safeway, superstore... that kind of stuff... car runs like crap. They are all watered down gasses (particularly the safeway/superstore stuff). Petro canada is bleh... its ok. By far my favorite gasses to run in the car were Shell premium and Husky premium. Shell premium ran very nicely, but I noticed the absolute best performance with Husky 94 Octane Ethanol enhanced. The Octane rating is for OCTANE (Which cannot be including Ethane or Ethanol, etc... any other type of hydrocarbon)... It has to be for the octane(C8H18) content. If it is not being accurately represented by Husky they are breaking the law IMO.
I found my car to run much smoother and be peppy with the husky gas... I even had noticeable improvement in power (HP/Tq.) when I pushed on it. The husky did the same (its premium gas right?) but the husky stuff was very nice. I try to run only husky or shell gas in any vehicle I drive now... I've also had less engine nasty ness (read dirt) and smoother running since getting picky with these fuels.
I dont know anything about wrecking the engine but I HAVE heard talk of what you mentioned before... but my golf ran like a champ with that gas, and so does any other vehicle I've owned.
Cheers,
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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