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octane

  1. smart Operation and Maintenance
    This is the third time it’s happened but this time the check engine light came on. Also is it safe to use 93 octane instead of 91? I have a 2011 Smart Fortwo
  2. New Members Area
    Hi everyone, I bought a smart Pure on Tuesday night - great deal at 10k miles and $500 under retail KBB. This is my frist car that had less than 80k when I got it, and I'm stoked! I named him John Galt, Jr., because now that I have keyless entry I feel like I'm in the ruling class! (this is...
  3. smart Fuel Economy
    Is anyone else adding Ethanol to the tank? I mean the car, not to yourself.... I am adding about a quart of E-85 (15% gas, 85% ethanol) to a fill up, to bring the octane up a point or two. Total ethanol percentage not to exceed 15-17.5%... Info I have says you can run about 22-23% max...
  4. smart Operation and Maintenance
    Has anyone tried 100 octane fuel? Is there any performance/economy gain?
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