Supermarket fuel
Comments
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cooldad wrote:AFAIK once an ECU is mapped, it's simply a curve, and the brain just reads settings off the curve for that set of sensor readings. The mapped curve can't change by itself.
Indeed it is the ECU and its a fact it can take a tank or two to adjust correctly as your tank is never empty when you refill. Cor talk about go off
I was just stating it in simple manner as possible as not everyone knows these things or are interested in the details.0 -
WisePranker wrote:cooldad wrote:AFAIK once an ECU is mapped, it's simply a curve, and the brain just reads settings off the curve for that set of sensor readings. The mapped curve can't change by itself.
That's correct. The map isn't just a curve, more of a 3D map. The fuelling will only be adjusted within the parameters of the map depending on various sensor readings.
Personally I've never noticed any difference on my car or bike no matter which fuel I use so I just use the cheapest!
On a modern petrol engine it adjusts the air/fuel mix to keep the exhaust gases within a specified range which is read from the lambda sensor.
A modern diesel measure the air density in the charge system and adjusts the fuel injected to obtain the ideal mix.
A little more complicated than a simple map.0 -
I normally use Jet as the are just around the corner and cheap. Never noticed any difference when using any other brand, but then I have a cr*p car.I don't do smileys.
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Parktools0 -
Ask yourself this how many refinery's to Tesco, Morrison's etc own?
thats right ZERO
Now when I'm at work i make about 750 m3/h of petrol this goes to big tanks and sold to the highest bidder they might add some additives but then again they might not.
When a tanker turns up to be filled to you really think we have a tesco tank, a Morrison tank, a shell tank, a Esso tank, a BP tank etc etc.
Nope you can make up your own minds[/i]0 -
i have witnessed an esso lorry leaving a tesco forecourt, where it delivered fuel...and then going directly to an esso garage to deliver fuel.
I usually go to the local esso though...'cos its close and generally as cheap as the supermarketWhenever I see an adult on a bicycle, I believe in the future of the human race.
H.G. Wells.0 -
So how many BP refineries are there in the UK?0
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cee wrote:i have witnessed an esso lorry leaving a tesco forecourt, where it delivered fuel...and then going directly to an esso garage to deliver fuel.
I usually go to the local esso though...'cos its close and generally as cheap as the supermarket
That's because Esso along with Shell supply all of Tesco's fuel....so to say supermarket fuel is substandard is popycock !!!!
(popycock ? where the hell did that come from...I may use this in frustration again !!)0 -
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Pudseyp wrote:cee wrote:i have witnessed an esso lorry leaving a tesco forecourt, where it delivered fuel...and then going directly to an esso garage to deliver fuel.
I usually go to the local esso though...'cos its close and generally as cheap as the supermarket
That's because Esso along with Shell supply all of Tesco's fuel....so to say supermarket fuel is substandard is popycock !!!!
(popycock ? where the hell did that come from...I may use this in frustration again !!)
Hmm but how can you explain my rather large differences on MPG in my car. between Shell and asda/tesco fuels.0 -
Thewaylander wrote:Hmm but how can you explain my rather large differences on MPG in my car. between Shell and asda/tesco fuels.
You'd have to have a lot of data to back that up with significance.
I'd want to know the precise amount of fuel being injected? over exactly the same trip with same traffic levels with lots of attempts to get even close to a statistically significant 'answer'
The only way would be round a track knowing the exactly how much has been used and doing it lots exactly the same way.
There are just so many variables even to that, from wind direction (gusts) to tyre pressures and how hot the day was.
In other words regression analysis....0 -
Some unleaded fuel is starting to come with ethanol which is plant based extract.
Ethanol produces less energy than normal unleaded which would cause higher MPG as it uses more fuel.
Small engines (Briggs,Honda,Etc) do not run well with more than 10% ethanol.
Ethanol attracts moisture and if to much in fuel, it can melt plastics.
Tescos at the moment are using ethanol which would be Esso.
summer fuel and winter fuel is different and unleaded fuel has a life span of approx 1 month. After this it breaks down and becomes stale unless certain fuel additives are used.
I cant speak for cars but this is the story with smaller lawnmower engines.0
