[Coojo]

I decided to try a tank of Premium in my PP just to see if my mileage would improve. With Regular gas, I was getting 24+ MPG so I figured with Premium, I might get 25-26+ MPG. To round out my first 2000 miles, I put in a tank of Premium and my MPG went down to 22.5 MPG. Same driving rountine, no heavy foot .... just seems odd?

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[Nipper Dog]

I've always heard that using premium fuel in a modern car designed for regular is a waste of money because the computer(s) compensate for the octane used.

 

[hondo]

Now try ethanol free E0 but ensure you do this on a full (empty prior) tank. We use WAWA E0 locally. Same price as premium but 91 octane E0

For research, google density of ethanol compared to fuel without ethanol

 

[DudeCS]

Here is a recent article and video..."Here's A Cool Cutaway Explaining Engine Knock And Fuel Octane"

 

[novabus]

yeah that's the point. It's the ethanol that messing with our mind. Where I live, the only type of gas which is E0 is the 91 octane. Our regular gas is E10.

 

[darksky]

I'd never heard, nor believed that running Premium gas in and engine designed for Regular would increase MPG. Premium fuel is generally recommended for higher compression engines including many newer 4-cylinder turbo engines and large V8 engines.

 

[hondo]

Currently our local WAWA stations are selling non-premium (89 octane) ethanol-free E0 and the price is less than 92/93 octane premium per gallon. We run this same E0 in all our small engines, 4 cycle blowers, 4 cycle trimmers, 4 cycle chain saws, lawn mowers, generators, chippers. This E0 is also our 2 cycle 50:1 mix fuel source.

 

[novabus]

According to wikipedia, regular 87 with 0% ethanol has 114,100 BTU of energy per gallon while regular gasoline with 10% ethanol has 111,836 BTU per gallon.

 

[CAJack42]

I got some of my best mileage running 85 octane while above 4000 ft. elevation. (measured - not what dash showed)

 

[herothedog]

Use the rating for the vehicle, higher Octane does nothing to improve performance. Octane reduces the volatility of heptane, so it does not detonate prematurely under compression. The higher the compression the motor the higher octane is needed. When adding higher than needed octane all that is done is pouring money down the drain, it does absolutely nothing else.

How Gasoline Works

Without gasoline, the world as we know it would grind to a screeching halt. The U.S. alone consumes well over a hundred billion gallons of gasoline per year. Learn all about this vital fuel.

science.howstuffworks.com

 

[Indy421]

The PP manual says 87 or higher. What's everyone running? I'm coming from a Mark 7 VW GTI that took premium so I'm used to the cost and my PP is brand new so I'm inclined to keep using it.

 

[ProdGirl]

The PP manual says 87 or higher. What's everyone running? I'm coming from a Mark 7 VW GTI that took premium so I'm used to the cost and my PP is brand new so I'm inclined to keep using it.

I just us the standard 87 and have no issues.

 

[mtgriff]

Regular for me.

 

[Cilles]

Regular is 87 around here to I see no reason to run higher

 

[pshadoa]

Using a higher octane may seem like a good idea, but it will serve no purpose in your PP other than to deflate your wallet. I have to use it in our two BMWs but smile when I pull up to the pump in the PP and can use 87. But as of late, since we are both retired, and because of Covid-19 we are not using too much gasoline at all. But sure have increased our Amazon spending!
Just be sure to use a "Top Tier" gasoline, (which Costco is BTW), and stay away from the independents.

 

[carpayments4life]

Every 5th or 6th tank, I will use 93 octane, from Shell or BP/Amoco. Otherwise 87 test.

 

[MattyNice]

87 for me. Never minded putting 93 in my Si cars, 2 of which required it due the high compression and redline, but no need in the PP. Highly debatable topic but I’m of the opinion that the octane rating is it’s resistance to pre detonation. Nothing to do with it’s quality.

 

[CHEFERMAN65]

The PP manual says 87 or higher. What's everyone running? I'm coming from a Mark 7 VW GTI that took premium so I'm used to the cost and my PP is brand new so I'm inclined to keep using it.

Why? What do you think the higher octane will do or provide other than over paying for gas? Why is it people still to this day and age of technology believe that higher the octane, the better performance or more power it will deliver?

 

[stevenD]

Follow the Mfg recommendation (87) and be happy the VW is in your rear view mirror...!

 

[CHEFERMAN65]

Every 5th or 6th tank, I will use 93 octane, from Shell or BP/Amoco. Otherwise 87 test.

Again, why? If you use quality top tier gasoline from Shell or Chevron all the time, 87 is all your vehicle will ever need.