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Fuel Gasoline, Diesel, and Renewable fuel(s)

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Does premium fuel = better MPG?

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Old 04-10-2008, 10:19 AM
99BlueBlazer 99BlueBlazer is offline
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Does premium fuel = better MPG?

Does premium fuel (which obviously cost more) have any mileage savings compaired to regular unleaded? Other than the "octane" ratings I dont really know what is different between the quality levels of gasoline.
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Old 04-10-2008, 10:24 AM
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Re: Does premium fuel = better MPG?

no, use what owners manual says to use
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Old 04-10-2008, 11:10 AM
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Re: Does premium fuel = better MPG?

Higher octane just has more additives to prevent pre-detonation (aka "pinging"). Because of that it actually has a lower energy density than regular gas (which doesn't have as many additives). For a car rated for regular gas, premium fuel will get you worse mileage (by a little). For a vehicle rated for premium fuel, most will "detune" a bit to accommodate lower octane fuel without "pinging." That can often have a FE hit associated with it.

In short, if you car does not call for premium fuel, don't use it. You'd just waste your money.
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Old 04-10-2008, 01:53 PM
warthog1984 warthog1984 is offline
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Re: Does premium fuel = better MPG?

Quick answer-

Fuel grades that have different octane ratings are totally different beasts in how they ignite and expand in the engine. The best mileage will be using the fuel YOUR engine is tuned for. Otherwise your just wasting gas.
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Old 04-10-2008, 01:57 PM
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Re: Does premium fuel = better MPG?

I did my own experiment of 3 tanks each of 89 and 93 octane (my engine is rated for 87). I lost 4% of my MPG on 89 and 9% on 93.
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Old 04-10-2008, 02:01 PM
toastblows toastblows is offline
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Re: Does premium fuel = better MPG?

High compression ratios need higher octane to boost performance. Most cars are 86 octane min, and most min gas stations are 87. 87 will do you just fine. Even 85.5 they make in montana will work, has a nice ping to it
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Old 04-10-2008, 02:10 PM
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Re: Does premium fuel = better MPG?

At higher elevation, you can get away with lower octane without knocking. That's why places like Montana and from personal experience, Flagstaff can get away with selling it.
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Old 04-10-2008, 02:42 PM
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Re: Does premium fuel = better MPG?

Quote:
Originally Posted by 99BlueBlazer View Post
Does premium fuel (which obviously cost more) have any mileage savings compaired to regular unleaded? Other than the "octane" ratings I dont really know what is different between the quality levels of gasoline.

Try to figure out what your engines compression ratio is. My toyota engine has 10.5:1, and would require high octane if it was not for advanced engine technology.

So it will run OK on regular, but with high-octane I have a huge boost on below 2000 rpm torque which help me a lot to get high mileage with manual gearbox.

Low octane fuel burn faster, but that really is only a problem with high-rpm situations. For a hypermiler it is very beneficial to trot along at 1500 rpm and high gear-high load without the engine whasting 50% of the energy because of anti-knock safety kicking in.

If I fill low-octane fuel I can feel an annoying dip in the moment curve at around 2700 rpm.
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Old 04-10-2008, 02:48 PM
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Re: Does premium fuel = better MPG?

I just wanted to add my $.02 worth to everyone else comments and say that premium will only give better FE in an engine that is tuned for it. You will get the best FE with the octane the car was designed for. In older vehicles, the lowest octane you can find that won't cause pinging will get the best FE. I would be curious to see what would happen if I could put 85 octane or less in my Prius.
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Old 04-10-2008, 03:09 PM
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Re: Does premium fuel = better MPG?

Hi All:

___Let me add to Larry’s post. The MDX spec’s “Premium Recommended” and unless you are laying into it for the IGN to back off due to the KS, Premium is an absolute waste as regular unleaded will allow her 30 + on the highway at most any time of the year. My experience with regular unleaded in the MDX anyway?

___Good Luck

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