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I own a 2015 fortwo and was wondering if it would hurt to run regular gas versus the recommended premium gas.

You'll be flooded with varying opinions, however I recommend premium through and through for longest engine longevity. Regular octane should be acceptable for easy driving conditions, however these engines really should have the premium fuel and will help the engines last longer. Expect a 3 to 5 horsepower drop with regular octane when compared to premium. That's why premium is recommended.
 

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All generations of the fortwo are engineered to handle ethanol like all modern cars are. If you don't have an E0 station near you don't sweat it.

On the other hand, vintage vehicles and small engines like lawnmowers...
 

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We certainly have talked a lot in the past over the regular versus premium. Yes it is a matter of opinion, but before forming you OWN opinion you should have the facts. So for Rcaldwell51 here was my last rant on the subject. Entry #9 was my rather long stand on the soapbox and I am NOT the expert...... DCO

https://www.smartcarofamerica.com/forums/f4/regular-vs-premium-according-expert-151936/
Piggybacking on DOC above comments.

I can't think of one auto manufacturer who Wants to INFLATE the costs associated with ownership of one of their vehicles.
So, that being said, I'm sure Mitsubishi engineers have good reasons to recommend 93 octane nothing lower than 91 octane. And even with the added long term costs associated with having to use high octane fuel, Mercedes still chose to use that engine. :shrug:

It is your car so it is ultimately your choice. But you did ask.
 

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Just Curious.
Can anyone (specifically owners who want to use 87/89 octane instead of 93/91 octane fuel) speculate as to why, Mitsubishi engineers determined their engine design would run best / last longer on high priced 93/91 octane fuel or why Mercedes used this engine despite the HIGHER operating cost to the owners:shrug?

Maybe a weakness showed up with burnt valves that was alleviated (not cured) using higher octane fuel. :shrug:

JL:smartje.bl.zl:
 

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Just Curious.
Can anyone (specifically owners who want to use 87/89 octane instead of 93/91 octane fuel) speculate as to why, Mitsubishi engineers determined their engine design would run best / last longer on high priced 93/91 octane fuel or why Mercedes used this engine despite the HIGHER operating cost to the owners:shrug?

Maybe a weakness showed up with burnt valves that was alleviated (not cured) using higher octane fuel. :shrug:

JL:smartje.bl.zl:
More power. This car wasn't designed to cater to American cultural standards of large gas hogging engines. The smart fortwo is a European car, so the engine size is capped at 999cc's or less, for European engine class reasons. The car we drive here in America is nearly a direct clone of its Euro counterparts with the exception of a few very minor modifications to lights, safety features, and removal of start/stop feature for gas engines for the ones shipped to America.

Higher octane allows improved efficiency and increased power. If it was designed specifically for 87 octane it would have been a slower car.
 

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More power. This car wasn't designed to cater to American cultural standards of large gas hogging engines. The smart fortwo is a European car, so the engine size is capped at 999cc's or less, for European engine class reasons. The car we drive here in America is nearly a direct clone of its Euro counterparts with the exception of a few very minor modifications to lights, safety features, and removal of start/stop feature for gas engines for the ones shipped to America.

Higher octane allows improved efficiency and increased power. If it was designed specifically for 87 octane it would have been a slower car
.
Agreed, but it wasn't the point of my post.
 
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