Drive a Zafira 1.6? Get 7 more mpg!

[TW]Fox;17213235 said:
What sort of professional test would use 'when the light comes on'?

Surely the best way to do this test would have been to brim the tank, drive 200 miles over a SET ROUTE at the SAME TIME of day, then brim the tank and calculate MPG.
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The Gadget Show Review Type
 
Demon said:
Are you saying that under absolutely no circumstances, the engines can be run in a manner that might yield higher gains from SUL, no matter how specific those situations?
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Nobody is saying that. Most people would agree that on many engines, SUL yields a benefit. After all, most of us use SUL and we wouldnt do so if there was zero benefit from doing so.

But the benefit isn't anything like that claimed in this report or claimed by MikeHiow.
 
[TW]Fox;17227190 said:
You don't have extensive and intricate knowledge of the engine in a Hynundai Getz but you'd be able to tell me to shut up if I said I got 100mpg from one.
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Sure, but 100MPG is ridiculous - 6MPG isn't.
 
[TW]Fox;17227215 said:
Nobody is saying that. Most people would agree that on many engines, SUL yields a benefit. After all, most of us use SUL and we wouldnt do so if there was zero benefit from doing so.

But the benefit isn't anything like that claimed in this report or claimed by MikeHiow.
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For normal mixed driving and normal people, I agree, totally..

but I am totally willing to accept that you can find a manner in which to run an engine that would yield quite high differences, especially considering that ECU's for starters are inherently going to have gaping flaws in their fueling algorithms that can be exploited. And if you try and drive around in such a manner you will see higher gains then normal?
 
It is just as ridiculous when it is a THIRTY PER CENT INCREASE.

Just from going from Premium (Yes, thats right, Premium Unleaded is the lowest grade in this country) to Super Unleaded.

I do not beleive you. Neither do many other people.
 
Demon said:
Are you saying that under absolutely no circumstances, the engines can be run in a manner that might yield higher gains from SUL, no matter how specific those situations?
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I dont know, am I? You have been reading my posts.

To actually answer your question, of course im not, for a start that wouldn't be true.
 
I want to know what you base this on, you can blast out percentages all day long, but you still haven't offered a reason for why it is so ridiculous.
 
Demon said:
I largely disagree with Mike's stuff too, but I can see they where driving the cars in a very non normal manner (again, under 30MPG from a 1.6 focus that I average 38MPG under a reasonable mix of driving?)..
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Is it not normal to use your car to go to Bingo once a week in town, pop to the shops twice a week and go to play bridge with your friends each Sunday. All trips less than 5 miles across town? You can imagine thats exactly what Dorris might do.

Oh yes we have NO IDEA what the test routes are.
 
MikeHiow said:
I want to know what you base this on, you can blast out percentages all day long, but you still haven't offered a reason for why it is so ridiculous.
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Because you cant make a Petrol engine as efficient as a diesel in terms of MPG just by using different RON fuel. If you would I would know about it. Plus having Thorney involved makes an effort a pointless affair and especially when Mr ego-baller rolls in and plays devils advocate with 'experience' that declares improvemnts that are massively lower than the report the thread is based around. Ive tried Super in mine a few times, I simply can not come to any conclusion purly based on how varied driving on UK roads is.

Even changing the petrol engine to HCCI wouldn't yield such a gain.
 
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MikeHiow said:
Jonny, do you think, according to physics, that a 6MPG increase with SUL is impossible on a turbocharged engine?
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Lets add a bit of context here - its a 6mpg increase which represents an increase of almost 30%. We are not talking about 56 mpg instead of 50mpg.
 
Ok, refer to your knowledge. From what you know, can you categorically say its impossible?

Yes, this is from 21MPG to 27MPG.
 
Just for some more useful context let us remind everyone that the car in question is a Vauxhall Corsa, categorically stated by MikeHiow to be 'the best all round car you can buy for less than £20,000'.

Just to give you an idea of the thought process you are dealing with here.
 
Prince I4?

It must be possible I got 40MPG in a Mini Cooper S (R56).... :o Wait that was on normal petrol.

Mike do you think its possible to get 13MPG better going from SUL to 95?

Half the issue i have is Tesco 99 (I believe) gains octane from its blend with bio-ethanol, which itself has a lower energy content than the petrol its mixed with. So you are not only getting more, but more for less.
 
No it won't, I've certainly never seen anything like that kind of increase from using it. More like 1-2mpg ...and it's hard to say whether that really is down to the fuel used or the exact usage pattern for a given fortnight or something. Then again I am talking about medium to large N/A engines not forced induction stuff.

To me the most and only really 'noticable' difference when using SUL is the engine running slightly smoother and quieter, even then though on the kind of engines I am talking about ...you really have to go some to notice this differance as they are very smooth anyway, basically you have to sit there and concentrate to notice it ...and even then it could well be psychosomatic. I think the true advantage (on most cars) of SUL is the better additive package, for keeping your fuel system clean.
 
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Jonnycoupe said:
Prince I4?

It must be possible I got 40MPG in a Mini Cooper S (R56).... :o Wait that was on normal petrol.

Mike do you think its possible to get 13MPG better going from SUL to 95?

Half the issue i have is Tesco 99 (I believe) gains octane from its blend with bio-ethanol, which itself has a lower energy content than the petrol its mixed with. So you are not only getting more, but more for less.
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I experienced the best gains on V-Power and Texaco SUL, T99 yielded around 4-5MPG.

I see what you're trying to say with your mini example, but as I've said, this isn't something I've measured over two tanks - this was a consistent trend over 8 months of ownership.

Moeks said:
No it won't, I've certainly never seen anything like that kind of increase from using it. More like 1-2mpg
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The important difference is different cars will see different gains. So you can't say "No it won't" just because your car only sees a small improvement.
 
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