Question about Recommanded Fuel - 10th Gen Civic Forum
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post #1 of 19 (permalink) Old 11-12-2016, 01:29 PM Thread Starter
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Question about Recommanded Fuel

Due to being in Canada. Honda 2017 Hatchback only comes in LX and SPORT with no EX trim =.=". The recommended fuel for Sport is premium. However if I use regular fuel, would that void my warranty? Also, since they all use same engine is it safe to assume that using regular fuel really shouldn't cause engine knock
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post #2 of 19 (permalink) Old 11-12-2016, 11:39 PM
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The engine tune is different on the sport and that is why you require premium. I don't know if it would be enough of a change to harm the engine but you can bet it wont save you any money at the pumps because you will be down on power and mileage.

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post #3 of 19 (permalink) Old 11-13-2016, 09:07 AM
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I bet there is a clause in the owner's manual that says you can use lower octane fuel but you will notice reduced performance and mileage.


My S2000 uses premium fuel and it has the same statement in the owner's manual.


You might be able to get away with 89 octane, but I'm just guessing. At the end of the day hatchback owners should be prepared to use premium fuel if they are buying such a vehicle, otherwise you may want to look at a non-hatchback model, you won't really miss or feel 6 crank hp.

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post #4 of 19 (permalink) Old 11-14-2016, 08:18 AM
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Here's what I found in the owner's manual.

Models with the label “PREMIUM
RECOMMENDED”

Unleaded gasoline with a Pump Octane Number (PON) of 91 or
higher is recommended.
Use of lower octane gasoline can cause occasional metallic
knocking noise in the engine and will result in decreased engine
performance.
Use of gasoline with a pump octane less than 87 can lead to
engine damage.
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post #5 of 19 (permalink) Old 11-14-2016, 03:02 PM
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Originally Posted by 4Tires View Post
Here's what I found in the owner's manual.

Models with the label “PREMIUM
RECOMMENDED”

Unleaded gasoline with a Pump Octane Number (PON) of 91 or
higher is recommended.
Use of lower octane gasoline can cause occasional metallic
knocking noise in the engine and will result in decreased engine
performance.
Use of gasoline with a pump octane less than 87 can lead to
engine damage.
Good info. That sounds about right, engine pinging will cause the ecu to retard timing and that will reduce power. I don't think anyone would run less than 87 octane as all fuel is 87 or higher . Pinging at lower rpms and low load isn't a big issue, I wouldn't want it at higher rpms or high load though. 89 octane "may" work, but count on 91 for full benefits and protection.

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post #6 of 19 (permalink) Old 11-15-2016, 08:25 AM
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At least we know now that 87 Octane won't damage the engine, just get the occasional knocking if you really want to save on gas. Maybe 89 Octane won't have the pinging problem.
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post #7 of 19 (permalink) Old 11-15-2016, 08:51 AM
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I think all modern cars out there will compensate for low octane fuel unless the car has an aftermarket tune dumped in or is considered a high performance product (like the Si may be, even then I'd be suprised if it can't run on 87. Manufacturers would have a hard time proving that low quality fuel was the cause of engine failure so they map in a countermeasure to save themselves from big bills.
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post #8 of 19 (permalink) Old 11-16-2016, 08:40 AM
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Anyone going to give 87 octane a try? I'm not expecting huge changes to how a Civic drives, but it'll be a confirmation that nothing really happens to the engine.
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post #9 of 19 (permalink) Old 11-16-2016, 08:45 AM
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Originally Posted by JS2000 View Post
Good info. That sounds about right, engine pinging will cause the ecu to retard timing and that will reduce power. I don't think anyone would run less than 87 octane as all fuel is 87 or higher . Pinging at lower rpms and low load isn't a big issue, I wouldn't want it at higher rpms or high load though. 89 octane "may" work, but count on 91 for full benefits and protection.
Colorado sells 85 Octane That's considered their "Regular"
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post #10 of 19 (permalink) Old 11-16-2016, 07:39 PM
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Originally Posted by B20Vtec View Post
Colorado sells 85 Octane That's considered their "Regular"
That is gross. lol. Pretty bad


Maybe they can get away with it due to the high altitude. ?

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