Fuel efficiency: 10 mpg loss after service. What to check?

Shell use less ethanol in vpower afaik, so you'll get a bit more MPG from it.

VPower is E5, same as everything else these days isn't it?

Shell's website says as much

This means that, in the UK, Shell regular unleaded and Shell V-Power unleaded are likely to contain some ethanol, but it will not be present at more than 5% (in accordance with current UK specification requirements).

As far as I can see, anything claiming VPower has a lower ethanol content is just unsubstantiated rumour from forums
 
Sounds like your the type of sucker Shell relies on
So I should use Tesco because you say so?
I never owned an iPhone, simply because I never wanted one, but certainly can afford one. My 200 pounds Sony is sufficient for what I need, but I wouldn't label someone a sucker if they choose to pay 1k for a phone. And even if the shell or BP costs more than few pences more per litre, I'm not covering 50k miles a year to matter.
Someone driving a tunned car or a smooth automatic can tell the difference from premium to regular petrol. And for diesel, the fewer regenerations than regular fuel must be magic, right?
I'm not against regular/supermarket fuel. Just don't use then. But certainly if I were driving too many mileages on a old van, few pences per litre would be a deal breaker. As would be a 30 pounds tyre instead of the likes of Michelin.
 
So I should use Tesco because you say so?
I never owned an iPhone, simply because I never wanted one, but certainly can afford one. My 200 pounds Sony is sufficient for what I need, but I wouldn't label someone a sucker if they choose to pay 1k for a phone. And even if the shell or BP costs more than few pences more per litre, I'm not covering 50k miles a year to matter.
Someone driving a tunned car or a smooth automatic can tell the difference from premium to regular petrol. And for diesel, the fewer regenerations than regular fuel must be magic, right?
I'm not against regular/supermarket fuel. Just don't use then. But certainly if I were driving too many mileages on a old van, few pences per litre would be a deal breaker. As would be a 30 pounds tyre instead of the likes of Michelin.
No...
But saying it's a fact like you did is stupid.

Absolutely no difference in performance between Shells or Tescos 99ron fuel.
 
No...
But saying it's a fact like you did is stupid.

Absolutely no difference in performance between Shells or Tescos 99ron fuel.
So you carry on using Tesco and I will use Shell. Not much cheaper locally to justify driving out of my way because apparently Tesco is the best fuel, as you want me to believe.
My experience with shell or BP, even their regular fuels, they're better than the regular from Sainsbury's, Morrisons and Tesco. Never tried Asda. Premium fuel, just tried shell and BP. Shell returned better mpg for me. Will try BP as my partner Mercedes runs better on BP, but mine is fine ATM with shell, so any improvement from my 60+mpg is a given.
Even worst someone spend 30k plus for a car and be worried at 2 pence per litre difference. Now you'll tell me to don't waste 2 pounds in screenwash and use plain water, as works, until the pump clogs and those 2 pounds every few months will sound like a bargain.
And the only reason I would consider Tesco's fuel would be if going for their nastiest fuel. No point paying premium over Tesco's fuel. As I wouldn't pay premium for a Primark t-shirt,but have no problems paying what they're worth.
 
Years back when i had a jap turbo nutter car there used to be very big changes i could detect between different types of fuel - the 97ron super supers.
BP ultimate would cause the car to feel like a student at 9am on a monday, it went ok but didnt really like it (map never was done for that fuel of course) - and it would seriously annoy the wideband far more than tesco or shells stuff.
This could be fixed by pulling timing but it was obvious not all top fuels were the same, or even close.
 
WARNING (added 2-3-2007)
Information has come in from the BBC (clarified by readers) that a batch of Greenergy 99Ron petrol sold by both Tesco and Morrisons has been destroying the lambda sensors of engines over the previous week to ten days. Many hundreds, if not thousands, have been affected. If you are one, Keep your petrol receipts because you are going to need them to get any repairs to your cars paid for by the supermarkets.
From Honest John
 
Years back when i had a jap turbo nutter car there used to be very big changes i could detect between different types of fuel - the 97ron super supers.
BP ultimate would cause the car to feel like a student at 9am on a monday, it went ok but didnt really like it (map never was done for that fuel of course) - and it would seriously annoy the wideband far more than tesco or shells stuff.
This could be fixed by pulling timing but it was obvious not all top fuels were the same, or even close.

Yea you'll notice it on a high compression, high revving engine as they are more sensitive to RON and the quality of the fuel. Not many cars have engines like that though.
 
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So you carry on using Tesco and I will use Shell. Not much cheaper locally to justify driving out of my way because apparently Tesco is the best fuel, as you want me to believe.
My experience with shell or BP, even their regular fuels, they're better than the regular from Sainsbury's, Morrisons and Tesco. Never tried Asda. Premium fuel, just tried shell and BP. Shell returned better mpg for me. Will try BP as my partner Mercedes runs better on BP, but mine is fine ATM with shell, so any improvement from my 60+mpg is a given.
Even worst someone spend 30k plus for a car and be worried at 2 pence per litre difference. Now you'll tell me to don't waste 2 pounds in screenwash and use plain water, as works, until the pump clogs and those 2 pounds every few months will sound like a bargain.
And the only reason I would consider Tesco's fuel would be if going for their nastiest fuel. No point paying premium over Tesco's fuel. As I wouldn't pay premium for a Primark t-shirt,but have no problems paying what they're worth.
Keep chatting nonsense mate.

Btw, it's not 2p difference. Some areas it's up to 16p different.
 
WARNING (added 2-3-2007)
Information has come in from the BBC (clarified by readers) that a batch of Greenergy 99Ron petrol sold by both Tesco and Morrisons has been destroying the lambda sensors of engines over the previous week to ten days. Many hundreds, if not thousands, have been affected. If you are one, Keep your petrol receipts because you are going to need them to get any repairs to your cars paid for by the supermarkets.
From Honest John
Wow... 2007. Keep trying to justify yourself
 
Yea you'll notice it on a high compression, high revving engine as they are more sensitive to RON and the quality of the fuel. Not many cars have engines like that though.
No, turbo charged engines are far more sensitive to a fuels octane rating than a naturally aspirated engine. Stop posting uninformed twaddle

No...
But saying it's a fact like you did is stupid.

Absolutely no difference in performance between Shells or Tescos 99ron fuel.

If there truly is no difference in performance why does it bother you so much if someone else wants to spend a few more quid for a tankful to feel fuzzy inside?

I found V-Power to have marginally more knock resistance on the MX5 compared to Tesco 99
 
Keep chatting nonsense mate.
No, turbo charged engines are far more sensitive to a fuels octane rating than a naturally aspirated engine. Stop posting uninformed twaddle



If there truly is no difference in performance why does it bother you so much if someone else wants to spend a few more quid for a tankful to feel fuzzy inside?

I found V-Power to have marginally more knock resistance on the MX5 compared to Tesco 99
It doesn't. You also missed the point. I have an objection to his use of the word 'fact'.

Obviously gone over his head, and yours.
 
Aye thats true you do tend to see a little bit of an improvement with NA engines as well on super - i know my mk4 always did feel better on it until i remapped it and of course had to use 99 if i wanted the extra sharpness.

At the end of the day its down to the map always, you can make a high compression engine run on dishwater if your prepared to removed enough advance.

Det is nasty stuff, i dont know how many folk have actually heard it in reality on a car but its very obvious when it happens.
 
Not really. Most turbos will run fine on 95 ron...
My 2001 Volvo is designed to run on 98. It runs on 95 but is down on power. I use Momentum because I'm not made of money and VPower is ludicrous.

My friends A3 TFSI needs 98 as well.


But revvy NA engines often come mapped for premium fuel. If it has a compression of about 10:1 or more there is a good chance it will need it to run optimally.

I also ran my 2ZZ Toyotas on 99 (1.8 N/A 190HP) becaus they didn't seem happy on supermarket special 95. I didn't check the handbook though so I'm not sure if you're meant to put premium in them. I bet you are.
 
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