87 Octane Sport Mileage? - 10th Gen Civic Forum
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post #1 of 14 (permalink) Old 12-23-2016, 09:05 AM Thread Starter
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87 Octane Sport Mileage?

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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post #2 of 14 (permalink) Old 01-26-2017, 08:36 PM
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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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post #3 of 14 (permalink) Old 01-27-2017, 01:26 PM
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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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post #4 of 14 (permalink) Old 01-27-2017, 07:03 PM
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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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post #5 of 14 (permalink) Old 01-28-2017, 10:17 AM
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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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post #6 of 14 (permalink) Old 01-28-2017, 11:16 AM
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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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post #7 of 14 (permalink) Old 01-30-2017, 11:45 AM
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I predict blown head gaskets for those who use 87. Time will tell.
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post #8 of 14 (permalink) Old 01-31-2017, 08:32 PM
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I predict blown head gaskets for those who use 87. Time will tell.
I predict 4 less horse, and 2 mpg. Nothing else...

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post #9 of 14 (permalink) Unread 12-30-2018, 11:07 AM
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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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post #10 of 14 (permalink) Unread 01-31-2019, 11:44 AM
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I have about 3K miles on mine and alternate between 89 RON and 93 RON. I don't think a steady diet of 87 would be good. YRMV.

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