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I am waiting for the Sport Touring to arrive but the recommendation of Premium fuel is annoying me. Salesman said it could burn 87 Octane without a problem without knocking or pinging. I find that hard to believe. I know the mileage is said to be affected. Does anyone with a Sport edition with the Premium tuned engine have any real experience to share on this topic? Thanks in advance!
 

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I've put 1200 miles on my Sport Hatch. Only used 87. I got 35 MPG last fill up. Getting one tomorrow, on pace for 37 MPG. NO knocks or pings. I was getting 33 MPG in my 2013 Si using 93 octane. I am appreciating the fuel savings so far.
 

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I am waiting for the Sport Touring to arrive but the recommendation of Premium fuel is annoying me. Salesman said it could burn 87 Octane without a problem without knocking or pinging. I find that hard to believe. I know the mileage is said to be affected. Does anyone with a Sport edition with the Premium tuned engine have any real experience to share on this topic? Thanks in advance!
You're buying a $30k civic and then going to be annoyed and go cheap on the gas? If the difference is price of regular to premium is going to break the budget, it might be best to look at a less expensive civic that recommends regular.
 

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I know your looking for a definitive answer from someone with a sport who has tested both grades! Well I have not, but I am willing to bet that if you don't break even dollar/mile wise running premium over 87,that you will love the added performance and piece of mind that you not fouling your engine or cats for a dollar or two per tank.
 

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My old school brain thinks that with higher octane fuel the ecm will allow more timing advance....giving the 6 hp bump......otherwise I wouldn't think any harm from lower octane. I do tend to buy brand name gas in any case.
 

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You'll want to use high octane if you are driving aggressively, or during hot summer months when preignition is more likely due to hotter intake air.


Another option is to use premium every other fill-up and it averages out to a medium grade gas.


Keep in mind that you'll get about 1/4 gallon of whatever the last person dispensed if you fill at a station using single-hose pumps. My S2000 requires 91 octane, I mostly buy 93. However, when I top-off less than half a tank, I'll usually go for the cheaper 87 octane, especially during winter.
 

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When I told the salesman who sold us our 2018 Sport Hatch that our gas mileage is WAY less than what he says I should be getting, for a mix of 70/30 city-highway driving, he told us to use regular gas instead of premium gas. We also had the car in for a check-up to see why we only get 29mpg, and the service technician told us to turn off the econ mode. (the dealership guy giving us the intro to the car told us that econ mode is better for fuel economy. So, we are confused.)

My 45-year-old wife drives this car. She does not drive it aggressively at all. Mostly shuffling our kids to and from school and their activities. We used premium fuel. I thought this car is supposed to get 31mpg if you drive all city. And before buying the car, the salesman said that we should be seeing roughly 35mpg for a 70/30 driving pattern.

Should we turn off econ? Should we use regular fuel?

We have logged 3200 miles on the odometer. The computer says we have been averaging 28.9mpg over the course of the 3200 miles in the past 3 months. Any suggestions?
 

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I have used 94 Octane Chevron in Canada since I bought my Sport/Touring. I drive my car hard and don't get much hwy driving. Getting about 500KM a tank in town. When I have run a hwy trip through the mountains, I got 730km's on a tank. I have not touched regular gas since I bought the car.
 

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I just went thru my first tank of gas. According to my salesman they fill up with 87 octane. Here's a pic of my dash.

My average speed has been around 50 mph (between 30-70 mph). For the 1st 150 miles I shifted at 3K rpm. Since then I've been shifting at 3.5K rpm. I've been blipping the throttle during downshifts so I maybe using up more gas than others.

I hope to get more efficiency from the 91 octane that I filled up with today. Aside from dashboard numbers, I also need to get a feel on engine performance and decide whether or not the extra cost of $0.47 per gallon is worth it.
 

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Efficiency actually went down. I am at 36.5 mpg after my 2nd fill up.

But I’m also shifting at higher rpm, and have spent a few hours teaching my wife to drive the manual at parking lot speeds.

I’m staying with 92 octane for now since it’s recommended and I’m coming from an 18 mpg 4Runner so I don’t feel the extra 40+ cents much with the civic being as efficient as it is.
 

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I have had my 2018 Honda hatch Sport 6 spd MT for over a year with 39,500 miles. I have noted that the Eco mode affects the Cruise control making it less sensitive and slower to respond thus saving gas for accellerations not required at highway cruising speeds. I found that the time spent in NYC traffic with many stops greatly affects the mileage. I typically will get 35 to 40 mpg on hwy cruise. City driving with stops and starts is quite variable and the take off at the lights is quite fuel consuming. Using 87 exclusively. Conservative driving with occasional Turbo push to 100% once a week to keep everything working. My average mileage is 32 to 38 mpg. Hope this helps.
 
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