Tip & How-To about Honda Accord

Octane Myth

What is octane? Octane cannot be seen, but it is of utmost importance when it comes to gasoline. One thing for sure, higher octane fuel costs more. Allot more! Simply put, octane is a measure of gasoline's ability to resist detonation, which you hear as pinging and knocking in your engine. The higher the octane the more the fuel can be compressed without detonating before you want it to. Detonation, ping, knock, whatever you want to call it, occurs when the air/fuel mixture ignites before the spark plug fires. The mixture ignites from compression and not from the flame of the spark plug. In other words, the higher the octane the less likely it is to ignite prematurely. The only benefit to a high octane fuel is that it allows an engine to run at a higher temperature and with a higher compression ratio without pinging. Higher octane fuel does not provide more energy, more power, better mileage, more torque, burn cleaner, clean your engine, and is not better for the environment. If the engine is pinging when using the correct octane fuel, then it may be necessary to move to the next higher octane to prevent pinging, and damage to your engine, unless there is another problem. If you are using higher octane fuel for any of these reasons, STOP, you are throwing your money away. Also, never use a lower octane fuel than is recommended by the manufacture. If the manufacture recommends 89 octane then use 89. If they recommend 87 then use 87. The key is what was the engine designed to run at to achieve optimum performance and mileage? One exception is when you are towing a heavy load with a vehicle designed to run on 87 and you experience pinging. In that case it may become necessary to switch to 89 while towing. In conclusion, race car engines are designed to run on high octane fuels due to their high compression engines. You cannot make your engine a race engine just by upping the octane. Save your hard earned money, and use exactly the octane you need.

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Must we use 91 octane gas in 2018 3.6 liter engine


no
it is not mandatory to use any octane rated fuel
however if the manufacturer recommends 91 octane, then that will be the fuel most suitable to run the engine economicaly
If you use 98 octane there may be some noticeable improvements in performance but that comes at a much higher cost for the fuel
The general rule is
lower rated octane for lower compression engines , lawn mowers and the like
medium octane for the average range of vehicles
and high octane range for high compression high performance engines

Feb 13, 2018 | Cars & Trucks

1 Answer

i have a 2005 Dodge dakota 4x4, is their a certain type of gas that i should be using


If it has the original engine then regular gasoline works just fine. Some people think that if they put in higher octane gasoline in their vehicle that it will run better. That is just not the case. All you wind up doing is wasting money. Vehicles that NEED higher octane fuel are designed to run on higher octane fuel.

Oct 25, 2017 | Dodge Cars & Trucks

1 Answer

What kind of gas does a maxima 2001


According to page 10-3 of the 2001 Nissan Maxima Owner's Manual:

FUEL RECOMMENDATION
Unleaded premium gasoline with an octane
rating of at least 91 AKI (Anti-Knock Index)
number (Research octane number 96)
If unleaded premium gasoline is not available,
unleaded regular gasoline with an
octane rating of at least 87 AKI (Research
octane number 91) can be used.
However, for maximum vehicle performance,
the use of unleaded premium gasoline
is recommended.

Engine "knock" is not just an unusual sound - but over time can cause real damage to the engine. You *should* use fuels with the recommended octane levels, but if you choose to use fuel with a lower octane level due to reduce fuel costs - do not repeatedly use fuel that causes engine knock. Find the "sweet spot" between the cost of lower octane fuel and an octane level that does not cause knocking. Expect fuel economy and performance to drop with lower octane fuels, too.

Good luck!

Feb 12, 2012 | 2001 Nissan Maxima

2 Answers

was told to use premium 89 octane gas only this true?


This is true. The only time you need to apply gasoline with higher octane is when preignition is present. If it sounds like marbles are bouncing in your engine when you are driving then get higher octane. However if the car is in good mechanical condition (cooling system, oil serviced regularly) then 89 octane is perfect.

Jan 03, 2011 | 2001 Buick Century

1 Answer

Regular unleaded or Premium ?


This is a wide range of fuel types. Minimum Octane level to run decent is normally 87. Up in the northern areas and hilly states I've seen this a little lower. Typically your choices are 87 octane, 89 octane and 93 octane. I recommend using the 89 octane or mid grade to get the best mileage and consistent performance from the vehicle. You will get better mileage from the higher 93 octane or Premium but this is off set by the increased soot and build up over time and the mileage isn't that much better to justify the cost between the Mid and Premium grade fuels.

Aug 03, 2010 | 1995 Volvo 850

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