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Thread: Long term super vs standard economy test

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    Regular Member Flaninacupboard's Avatar
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    Default Long term super vs standard economy test

    After reading this previous thread http://www.vectra-c.com/forum/showthread.php?t=74555 i am running a long term test on super unleaded. i have collected data on 24,000 miles of mixed driving (mainly leisure/pleasure) using standard unleaded in the first image. I will be posting up data from each tank of super, to eventually build a similar amount of data. this will take me some time! Personally i expect to see a very small increase in economy, but not enough to pay for the super.

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    Regular Member Maverick's Avatar
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    I have proven (To my bank balance) that running Shell V-Power or BP Ultimate does slightly increase mpg, enough to cover the extra cost of the decent fuel as you get a few more miles out of the tank full.

    But what I have noticed 100% is that the car's engine runs smoother and the fact that the fuel system is being kept very clean.

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    Normal fuel contains detergents too.....

    Personally, I am looking forward to your long term tests. I seriously doubt that any fuel economy gains will effectively pay for the extra cost of fuel. In fact, I'd be AMAZED if it does.

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    Regular Member WeDesign's Avatar
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    Vehicle : Vectra

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    How interesting ... another one of these threads!!!

    will people ever accept its not that advantageous to use premium fuels

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    Clearly not. I don't recall anyone on here doing such a long term test though, and on a petrol.

    If he does another 25K on super, then it would be a great test.

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    Regular Member Maverick's Avatar
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    Quote Originally Posted by Ste View Post
    Normal fuel contains detergents too.....

    Personally, I am looking forward to your long term tests. I seriously doubt that any fuel economy gains will effectively pay for the extra cost of fuel. In fact, I'd be AMAZED if it does.
    But it does. I have done the maths on it, it costs me no more to run V-Power than normal diesel. But I do an average of 2500 miles a month which could have a baring on it.

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    Regular Member Maverick's Avatar
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    Quote Originally Posted by DavidJS View Post

    will people ever accept its not that advantageous to use premium fuels
    But it can be advantageous. Fact.

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    Regular Member RobW's Avatar
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    How many people have exactly the same driving style for a whole tank of fuel?

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    That is the point. If you do it over a long term, then normal tank to tank variation isn't affected, and a more accurate comparison can be made.

    This thread is about petrol, not diesel though. And I think the 'facts' about advantages aren't proven in normal use.

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    Regular Member WeDesign's Avatar
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    Vehicle : Vectra

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    The only thing I can see from using premium fuels is Yes you do get a few more MPG but at a cost on average of 7p - 8p a litre more it costs that much more to fill the tank.

    Therfore the for cost of standard fuel you can purchase a further gallon or more of fuel and then you will get those extra miles.

    Bottom line is that Pound per mile I would think it probably breaks even.

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