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Old 08-25-2017, 03:27 AM   #11 (permalink)
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Honda say 95 RON, Regular. But Jazz enthusiasts, here in the UK, claim better running using Premium, so I thought I'd give it a try.

The engine is 10.8:1 compression, so not all that low.

Yesterday afternoon I had a 20 mile run and, perhaps it was just in my head, but the car has never been smoother or quieter(!).

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Old 08-25-2017, 12:10 PM   #12 (permalink)
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My motorcycle has a 12:1 compression ratio and runs regular 87 PON. Somehow short stroke, small displacement engines can get away with that.
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Old 08-25-2017, 01:14 PM   #13 (permalink)
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I've never had any complaints with my Jazz running on Regular supermarket petrol. I just thought I would give Premium a try to see if it gave me better mpg, after many people said they had noticed an improvement. That certainly doesn't seem to be the case with my experience, so it will be back to the supermarket for my next top up next month.

The Jazz has about twice the stroke of the CBR600.
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Old 08-27-2017, 04:28 PM   #14 (permalink)
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Originally Posted by redpoint5 View Post
Somehow short stroke, small displacement engines can get away with that.
I have also noticed this in some Brazilian econoboxes fitted with 1.0L engines.
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Old 08-27-2017, 11:20 PM   #15 (permalink)
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I drive so much that i just buy whatever is cheapest. I do notice more power and better throttle response with premium, mostly due to the elimination of knock which also increases f/e. GM LY7 v6, non-di, 10.2:1
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Old 08-28-2017, 02:41 AM   #16 (permalink)
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Since most of the vehicles I drove were either some random econobox or had a relatively low compression, I never used premium gas.
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Old 08-31-2017, 11:26 AM   #17 (permalink)
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Well my best tank was vpower guess it works better with my copper v-powers plugs lol
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Old 09-12-2017, 11:52 PM   #18 (permalink)
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First off you run the octane that the owners manual says you're suppose to run in the car. If it says regular and you're running premium you're just wasting money.

Does better gasoline affect fuel mileage? From my experience yes in a big way.
Two cars, the first my fuel sucking pig a 1997 Volvo 960 with a 2.9L 24V engine. Manual says premium and over the last decade or more I've basically fed it what ever premium I could find that was cheapest.

A good friend does fuel mileage testing for some of the auto manufactures here in the states and he uses Shell gasoline exclusively. When I got this car it would get between 29.25 and 29.5 mpg (U.S.) on the highway at 65 mph.

I'd say since 2007 I've watched the highway fuel mileage drop slowly into the low to mid 26's. I had pretty much came to the conclusion it was the mandated E10 fuel that was causing the loss in fuel mileage.

So after a conversation with my buddy I ran the tank down to almost empty and tossed in a bottle Techron fuel system cleaner and filled up with Shell V-Power + Nitro. Took it out on a Sunday for a long ride to see if there would be any change. About 200 miles out there was a big change that caught me by surprise, the engine smoothed out to the point that it grabbed my attention immediately. It was that dramatic of a change.

I didn't see any change in the fuel mileage during that day or during that tank of fuel. I'd say it was the third tank of Shell V-Power when I saw the change in fuel mileage. I took the car out for a long drive to see a car museum and on my way up I noticed my Scan Gauge was pushing through 27 mpg (U.S) and went to the mid 29's and stayed there until I got to my destination. On the return trip it never fluctuated more than a few tenths one way of the other and I still ended up with 29.2 mpg (U.S.) for the 400 plus mile trip.

My other car a 2010 Prius is my daily driver and again I had use the cheapest regular gas I could find most of the time. I did the same routine a few months later, I tossed in a bottle of Techron to jump start the cleaning process and filled it with Shell regular gas. I ran a few tanks through it and didn't see much of a change in fuel mileage due to short trips and lots of hills around me.

I had a chance a few months ago to make a longer than usual highway trip in the car and was pleasantly surprised at my fuel mileage increase. Normally I would get 52-53 mpg (U.S.) on the highway at 65 mph. Now the cars fuel mileage had increased to 56 mpg (U.S.).

A few weeks ago I wanted to see if the mileage had stayed up or that earlier trip was a fluke. I ran the car all day on the highway at 55 mph (Cruise) with the AC running for over 300 miles and I ended up with a 61.3 mpg (U.S.) average (Scan Gauge) for the day.

For me personally I'm sold on Shell gasoline and if I can't get it I'll only use another TOP TIER fuel in either car. Fortunately the local Shell station by my home is the same or only two or three cents more per gallon than the off brand stations.

The benefits of the Shell over the off brand is it will clean the crud out of your fuel system over a few tanks of gas and keep it clean. If the Shell is prohibitively expensive you might want to run a fuel system cleaner through the car every couple months as a preventative measure.

There have to be other gasoline suppliers near you other than Shell, that have a higher than mandated detergent package in their fuels. Here in the states they are referred to as Top Tier fuels due to the much higher concentrations of engine cleaning detergents.

Last edited by ALS; 09-12-2017 at 11:58 PM..
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Old 09-13-2017, 03:05 AM   #19 (permalink)
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We have 6 filling stations in the area I stay. 3 Supermarkets, a Shell, Esso and a BP station. The supermarkets all sell within 1p per litre of each other and the "quality" stations are all the same high price.
I am just going back to the cheapest supermarket petrol in future. I have used it for years and have never had a problem. It is not as if we have E10 in the UK.
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Old 09-13-2017, 08:59 AM   #20 (permalink)
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Quote:
Originally Posted by ALS View Post
I had pretty much came to the conclusion it was the mandated E10 fuel that was causing the loss in fuel mileage.
Not only ethanol has a lower energy density than gasoline, a higher blend of it is used in order to fix the octane-rating of a lower-grade gasoline. It's happening here in Brazil, where the mandatory blend had reached 27% last year (25% for certain premium gasolines).

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