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91 Octane gas is recommended but the owner's manual state that 87 octane can be used. It says that 87-90 octane will reduce performance slightly such as reduced engine output and engine knocking. It also says that while using 87 hearing a light knocking sound from the engine is not a cause for concern.
 

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Sorry Clutch_22 I realized I did answer your question. Regular gas is 60 to 90 cents cheeper than premium depending on the station. With only a little reduction in performance and no harm to the engine why should I wast the money.
 

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The price difference between regular and premium used to be ten cents. Now its a dollar. In Illinois, they sell 87, 89, and 93. So if I had the motivation, and time, I would alternate 89 and 93, filling up every half tank. In actuality, I'll just use 93, since I am not using the car for a commute and so my miles are few.
 

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Why should you waste the money?

As you wrote :

1) "91 Octane gas is recommended..."

2) "...It says that 87-90 octane will reduce performance slightly such as reduced engine output and engine knocking."

3) "It also says that while using 87 hearing a light knocking sound from the engine..."

You make a really good argument here... To use 91+ Octane fuel.
 

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91 Octane gas is recommended but the owner's manual state that 87 octane can be used. It says that 87-90 octane will reduce performance slightly such as reduced engine output and engine knocking. It also says that while using 87 hearing a light knocking sound from the engine is not a cause for concern.

Hey uhhhh engine knocking is a cause for concern...lol. Using a grade lower than 91 octane temporarily is fine, i.e. if you pull up to a gas station and they don't offer it. If you constantly put 87 octane in your engine it will legitimately affect reliability later down the road.

It's your car, not mine, so I'm not going to tell you what to do. I'm just suggesting that you really don't regularly fill up your car with 87 octane. Cheers.
 

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Yesterday I paid $4/gallon for mid grade gas —they didn’t have premium. I can’t remember the last time fuel prices were this high. I am absolutely loving the fuel economy of my Spider.

Coming from a Jeep Wrangler, the Fiat’s fuel economy is addictive! I’m going to have driven 2,000 miles in the first month; that’s twice the miles I normally drive in one month.
 

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First 70 degree day in Chicago Monday so my wife and I took a drive out to Starved Rock state park. Two lane highway out with the top down netted 38.5 mpg. I-80 back with the top up at 75 mph with a slight tailwind, AC on, cruise on, equaled 39.5 mpg.
 

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It would be interesting to see a comparison of mileage between Sport and Normal modes on the Abarth Spiders. Of course for me "Normal" IS Sport mode, but that's a separate discussion. :D It is an absolute pleasure to pull up to a pump in the Spider and leave $12.00 later. With my SUV, it can be up to five times that amount! Also, has anyone had any experience running non-ethanol 91+ octane gas? It's sort of hard to find, but there are a few places in my area where I can get it. I'm just wondering if it's worth the extra cost and effort.
 

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Normal mode should not exist lol.

I guess it is a rainy day button / long distance cruiser mode? XD
 

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Do any of you guys used additives after oil changes? My friend suggested I do so. Those little bottles they sell that auto shops.
 

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I bought a new 2017 Lusso holdover. I've been driving it as daily driver for two months and all I get is 17 Mpg in the city, haven't had any highway driving yet. I have a twin turbo V8 that gets about 15 Mpg. Do I have a problem and should I be concerned?
 

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Break in is 1k
 

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It may very well be that the first few miles are dragging down your average - the first 5 to 10 miles were probably at around 4mpg. You can reset the mpg and have a do-over to see what you get under your conditions.

I don't get as high as some people - low 20's around town but 30's on the highway.
 

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Thanks for all the responses I appreciate the help. I'll give it more time, I love driving my spider, always puts a smile on my face.
 

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Who has two thumbs and his foot on the gas?!
Apparently this guy!
I get 24.9
Man i have set it to see current when I am footing it out in turbo sport mode and it's like a Sherman tank at 3 MPG!
LAWD!!
 

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I've never gotten as high as some people here on the forum but after 5000 miles I'm usually seeing mixed driving about 24-26 mpg and around 29-30 for highway. Hasn't seen a tank over 30 even when I babied it on a trip.
 
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