Who uses which fuel?
16 November 2013, 08:46 AM
#34
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My car is on a standard map with a sports cat system. It seems to prefer VPower. I tried momentum a couple of times but it seemed to hesitate slightly. Plus my mpg was worse.
16 November 2013, 12:35 PM
#35
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My car has been mapped on v-power and I've only ever used that fuel. In theory there both 99Ron....but, not going to take the chance.
This question has been asked before, and people have said that they get better mpg off momentum. But why do mappers tend to stick with V-Power. Have a little search.
This question has been asked before, and people have said that they get better mpg off momentum. But why do mappers tend to stick with V-Power. Have a little search.
I was very hesitant about slinging 'cheap Tesco .....' in mine but I'm happy that I did (well I didn't, because imo Momentum certainly isn't ... and Tesco has a very good product there).
I'd recommend it, and it's fuelling a T20 Hawk, so I'd say fill up with it next time, and you'll definitely see a difference, if only in a slightly fatter wallet after.
16 November 2013, 12:40 PM
#36
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I'm not sure about free but with limited mileage in the Impreza I'd far rather pay more for V-Power. It seems more readily available at service stations too.
Also, I'm lucky enough that shell is the cheapest in the area bar Sainsburys, but I'm certainly not using that! Haha.
Also, I'm lucky enough that shell is the cheapest in the area bar Sainsburys, but I'm certainly not using that! Haha.
I haven't seen a Shell garage that didn't have V-Power/Nitro+ (petrol - there's a couple who don't have the diesel) but interestingly not all Tesco stations do Momentum.
Ours is a small supermarket and has it. A much larger 24-hr one 9 miles away doesn't. (Pontypool, Dan).
16 November 2013, 04:03 PM
#38
Ive only used Tesco99 in mine bar one time I put regular 95 in by mistake, it ran like a dog!
Anyways I'm under the impression that shell garages are franchised and some unscrupulous owners put cheaper 95 in the V Power tanks. Tesco on the other hand gain nothing by doing this as the manager gains nothing from the process.
Good question about the tescos additives, I was thinking about adding meth but I'm now gonna do some research.
Anyways I'm under the impression that shell garages are franchised and some unscrupulous owners put cheaper 95 in the V Power tanks. Tesco on the other hand gain nothing by doing this as the manager gains nothing from the process.
Good question about the tescos additives, I was thinking about adding meth but I'm now gonna do some research.
16 November 2013, 04:33 PM
#39
) Silicone is not allowed in any petrol in any quantity as it damages oxygen sensors and catalysts. This is why exhaust fitters should never use a silicone based sealant in the exhaust system of a vehicle that uses closed-loop fueling control.
I've also read an article in which octane ratings were checked. Shell were found to be well above the 99ron whereas others (including tesco99) were either bang on their number or slightly under.
I use both and no other.
I understood that T99 achieves its octane rating by the addition of around 5% methanol. Something to consider for those who add methanol to their fuel.
Therefore, assuming Shell does not use methanol then I would guess that Shell consumption should be better as the energy density of methanol is lower than that of petrol although I don't notice any difference between the two in use.
I understood that T99 achieves its octane rating by the addition of around 5% methanol. Something to consider for those who add methanol to their fuel.
Therefore, assuming Shell does not use methanol then I would guess that Shell consumption should be better as the energy density of methanol is lower than that of petrol although I don't notice any difference between the two in use.
And ALL fuels in the UK contain it (Blame the EU for that). That includes V-Power....up to 5%
Originally V-power (or Optimax) didn't contain Ethanol, but its ingredients changed and now its octane boosting ingredients include Ethanol...just like you find in Tesco or any other fuel - 95Ron, or 99Ron or whatever. Originally it was with a blend of Toluene, Xylene and Trimethylbenzene (no Ethanol). Now its Ethanol along with those ingredients except there's Ethylbenzene instead of Trimethylbenzene (
).But you are right about oxygenates like Methanol and Ethanol having a lower calorific value to "pure" petrol (which technically doesn't exist). Oxygenates also affect air-fuel ratios too which have a slight influence on MPG when used in vehicle operated in closed-loop mode.
Last edited by ALi-B; 16 November 2013 at 04:37 PM.
16 November 2013, 10:09 PM
#40
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That was a contamination. It affected their 95ron too and not just Tesco either (but mostly Tesco). Basically some numpty at a refinery fecked up (probably used silicone sealer to fix a leaky pipe or something ) Silicone is not allowed in any petrol in any quantity as it damages oxygen sensors and catalysts. This is why exhaust fitters should never use a silicone based sealant in the exhaust system of a vehicle that uses closed-loop fueling control.
See above - it was contaminated with silicone which is not an ingredient in ANY fuel. Its a pollutant, it doesn't belong in there, just like in woman's chesticles.
The law in the UK (BS7800:2006) , says superfuels must be a MINIMUM of 97RON...that include your 99Ron fuels. Which brings me to this point: Fuels degrade over time: Lesser used fuels like VPower and Momentum is MORE likely to have degraded IMO from standing under a filling station forecourt due to its lower overall throughput when compared to higher volume selling fuel like diesel and 95Ron, which are the more popular fuels. The fact that by law, Vpower and Momemtum only need to be a minimum of 97RON and 86MON to be legally sold in the eyes of HMCE, whereas 95RON has to be 95RON means that quality control with superfuels can legally be more relaxed. Whereas with 95RON you are highly likely going to get 95RON regardless of where it came from. Dwell on the likliness of having a "bad batch" of 95Ron vs a superfuel, be it supermarket or not. Location and how busy the petrol station is can have as much influence as the fuel itself.
Its not methanol its Ethanol.
And ALL fuels in the UK contain it (Blame the EU for that). That includes V-Power....up to 5%
Originally V-power (or Optimax) didn't contain Ethanol, but its ingredients changed and now its octane boosting ingredients include Ethanol...just like you find in Tesco or any other fuel - 95Ron, or 99Ron or whatever. Originally it was with a blend of Toluene, Xylene and Trimethylbenzene (no Ethanol). Now its Ethanol along with those ingredients except there's Ethylbenzene instead of Trimethylbenzene ( ).
But you are right about oxygenates like Methanol and Ethanol having a lower calorific value to "pure" petrol (which technically doesn't exist). Oxygenates also affect air-fuel ratios too which have a slight influence on MPG when used in vehicle operated in closed-loop mode.
) Silicone is not allowed in any petrol in any quantity as it damages oxygen sensors and catalysts. This is why exhaust fitters should never use a silicone based sealant in the exhaust system of a vehicle that uses closed-loop fueling control.See above - it was contaminated with silicone which is not an ingredient in ANY fuel. Its a pollutant, it doesn't belong in there, just like in woman's chesticles.
The law in the UK (BS7800:2006) , says superfuels must be a MINIMUM of 97RON...that include your 99Ron fuels. Which brings me to this point: Fuels degrade over time: Lesser used fuels like VPower and Momentum is MORE likely to have degraded IMO from standing under a filling station forecourt due to its lower overall throughput when compared to higher volume selling fuel like diesel and 95Ron, which are the more popular fuels. The fact that by law, Vpower and Momemtum only need to be a minimum of 97RON and 86MON to be legally sold in the eyes of HMCE, whereas 95RON has to be 95RON means that quality control with superfuels can legally be more relaxed. Whereas with 95RON you are highly likely going to get 95RON regardless of where it came from. Dwell on the likliness of having a "bad batch" of 95Ron vs a superfuel, be it supermarket or not. Location and how busy the petrol station is can have as much influence as the fuel itself.
Its not methanol its Ethanol.
And ALL fuels in the UK contain it (Blame the EU for that). That includes V-Power....up to 5%
Originally V-power (or Optimax) didn't contain Ethanol, but its ingredients changed and now its octane boosting ingredients include Ethanol...just like you find in Tesco or any other fuel - 95Ron, or 99Ron or whatever. Originally it was with a blend of Toluene, Xylene and Trimethylbenzene (no Ethanol). Now its Ethanol along with those ingredients except there's Ethylbenzene instead of Trimethylbenzene (
).But you are right about oxygenates like Methanol and Ethanol having a lower calorific value to "pure" petrol (which technically doesn't exist). Oxygenates also affect air-fuel ratios too which have a slight influence on MPG when used in vehicle operated in closed-loop mode.
Even I couldn't have expressed it more comprehensively
16 November 2013, 11:10 PM
#41
Actually, I need to correct myself - Momentum does indeed contain 3% methanol in addition to the 5% ethanol, so gdavey is right after all.
I can't say for certain if Shell contains trace methanol or not; as they keep changing their ingredients and I cant find a current data sheet. And that's not taking into account any possible variation between summer and winter - assuming they still change the blends for winter, and that's another level to look at. Petrol we are using now (usually October to April) can be different to that supplied in summer 
I can't say for certain if Shell contains trace methanol or not; as they keep changing their ingredients and I cant find a current data sheet. And that's not taking into account any possible variation between summer and winter - assuming they still change the blends for winter, and that's another level to look at. Petrol we are using now (usually October to April) can be different to that supplied in summer
Last edited by ALi-B; 16 November 2013 at 11:11 PM.
18 November 2013, 09:47 AM
#44
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Slightly hesitant using Tesco's, but it gives me more horses.
TBH there's no difference in feel or noticeable MPG when I fill Billy up with either. I can notice a difference in how the car pulls when my wife isn't in the car and she's only 126lbs.
TBH there's no difference in feel or noticeable MPG when I fill Billy up with either. I can notice a difference in how the car pulls when my wife isn't in the car and she's only 126lbs.
18 November 2013, 12:34 PM
#45
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You lucky man.
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