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post #1 of 18 (permalink) Old 04-13-2017, 08:29 PM Thread Starter
 
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Newb ? high octane fuel

Is it really necessary to only buy high octane fuel ?
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post #2 of 18 (permalink) Old 04-13-2017, 08:48 PM
 
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Necessary? Some people would argue that. Recommended? Yes, by both the manufacturer and many, MANY Smart owners (myself included). Why put lower octane fuel into the car and potentially end up lowering performance and mucking up the engine faster?

That aside... It's what... maybe $3 more to fill with 91/93 octane than it is to fill with 87? And generally half that if you go with the mid 89 octane? Why bother for such minuscule savings? Now if you were putting 91/93 octane into something like a Jeep Grand Cherokee with a 30-some gallon tank... then yea, maybe i'd say go down a notch or so. But for 7-8 gallons... don't see a point in going for anything less.
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post #3 of 18 (permalink) Old 04-14-2017, 03:13 AM
 
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I agree. If smart thought it was safe to use lower octane fuel, then I would think they would say so. This would be a positive in terms of increasing sales as people could save money using cheaper gas. High(er) compression engine not specifically designed for lower octane, why risk it?
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post #4 of 18 (permalink) Old 04-14-2017, 06:09 AM
 
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What about Ethanol content, up here at some stations Premium has no Ethanol while lower grades have higher percentages.
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post #5 of 18 (permalink) Old 04-14-2017, 06:49 AM
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smart USA says up to 10% ethanol is OK....
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post #6 of 18 (permalink) Old 04-14-2017, 07:12 AM Thread Starter
 
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Originally Posted by ElementalDragon View Post
Necessary? Some people would argue that. Recommended? Yes, by both the manufacturer and many, MANY Smart owners (myself included). Why put lower octane fuel into the car and potentially end up lowering performance and mucking up the engine faster?

That aside... It's what... maybe $3 more to fill with 91/93 octane than it is to fill with 87? And generally half that if you go with the mid 89 octane? Why bother for such minuscule savings? Now if you were putting 91/93 octane into something like a Jeep Grand Cherokee with a 30-some gallon tank... then yea, maybe i'd say go down a notch or so. But for 7-8 gallons... don't see a point in going for anything less.
well said . thanks
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post #7 of 18 (permalink) Old 04-14-2017, 07:57 AM
 
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Well said an worth repeating.

Quote:
Originally Posted by jzchen View Post
I agree. If smart thought it was safe to use lower octane fuel, then I would think they would say so. This would be a positive in terms of increasing sales as people could save money using cheaper gas. High(er) compression engine not specifically designed for lower octane, why risk it?


Remember it is always your choice.
Pay a little more at each fill or pay A LOT MORE LATER.......Maybe??????
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post #8 of 18 (permalink) Old 04-14-2017, 08:02 AM
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Having been through the burned valve/head replacement scenario with our 2011, nothing goes into it now except at least 91 octane and always a Top Tier brand.
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post #9 of 18 (permalink) Old 04-14-2017, 08:05 AM
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I found that buying the lower octane fuel, and especially with ethanol would drop the MPG to the point where it would cost more to run the lower grade fuel. Mostly purchase at places that do a lot of sales so I don't end up with bad gas.

If you do use a lower grade of fuel, your smart will adjust, but why make it work harder.
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post #10 of 18 (permalink) Old 04-14-2017, 08:30 AM
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Here the price delta for premium has risen to $0.50 per gallon. At $2 per gallon vs. $2.50 it isn't as clear cut. I tried back to back tank fulls and noticed no difference in performance and a 2 mpg drop... from 38 to about 36...
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