A
Anonymous
Guest
Used it a couple of times and the car definately feels livelier, not aware of any mpg difference. Am I doing any damage by using 99 instead of the recommended 95?
Twin Turbo
Active member
in the last 6 years i only use tesco momentum or shell ultra - no issues
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I have just completed a study of fuels in my Z4 23i, where I compared Asda 95 ron, Esso synergy supreme+ 97 ron and Tesco Momentom 99 ron. The objective was to ascertain which fuel gave me the best mpg without the loss of performance Vs cost (MPG).
In summary Tesco 99 ron is now what I am using. The Esso supreme+ is far to expensive when Tesco give the same performance.
I achieved 44.8 mpg on a run with the Tesco and Esso fuels, 40.9 mpg using asda. Around town, driving carefully I achieved 32 mpg against 26 mpg.
Note: Test results reported above were with the car in "normal" mode.
I live in a rural town so city driving will give totally different results.
Everyone drives differently - my tests were driving very sedately to say the least.
in sport mode pushing the car hard the results were totally different.
In summary Tesco 99 ron is now what I am using. The Esso supreme+ is far to expensive when Tesco give the same performance.
I achieved 44.8 mpg on a run with the Tesco and Esso fuels, 40.9 mpg using asda. Around town, driving carefully I achieved 32 mpg against 26 mpg.
Note: Test results reported above were with the car in "normal" mode.
I live in a rural town so city driving will give totally different results.
Everyone drives differently - my tests were driving very sedately to say the least.
in sport mode pushing the car hard the results were totally different.
R.E92 said:
But they have a higher concentration of cleaners present, at least according to the manufacturers ... surely not a bad thing ?
FWIW I always seemed to get approx 25 miles per tank more from super unleaded such as Optimax / V Power, etc ... meaning I guess it is a more efficient fuel ? This was over a number of years and car - always the same, more miles per tank when using super.
SO8 said:
I've never noticed an increase in MPG with the fuels. If anything the MPG should be lower as Tesco Momentum uses 10% ethanol concentration to get it's RON up to 99. Ethanol has a lower energy content.
I use 99RON fuels exclusively as I have an aggressive map on the car. If I use 97RON it will run but the ECU will have to make corrections to the ignition timing at high load to prevent pre-ignition.
The marketing is quite strongly biased towards the cleaning aspect, I suspect this is mostly bullshit but have seen no convincing unbiased evidence either way. I'm thankful that they are expanding the userbase though as it means people like me who want as higher RON value get access to it.
Shell claim they add their detergents to both the Fuel Save range and the VPower Nitro range. Might be a better buy if you are just wanting the additives.
R.E92 said:
Sorry, I should have said I have had increased range with Shell, not with Tesco fuel. I personally like the idea of giving the engine the best chance of producing all of it's power and as the 35iS was 'mapped' to higher output than the 35i by BMW I always used V Power.
My Z4 has gone but the new beast requires 98 RON according to the book so V Power visits will be just as regular
With the higher levels of cleaning product you arent going to notice anything different immediately by changing from 95 grade . The cleaning additives keep the fuel supply and injectors cleaner and also or in theory prevent build up of carbon in the combustion chamber. All this will ensure the car runs better and by definition achieve a few more mpg. But it will take time so you will need to fill up with the 99 stuff for probably several thousand miles before any benefits become noticeable (if at all).