Anyone use Momentum 99?

I've been using that since i got my Teg over a year ago as thats mapped for 100RON in japan so i need 99RON really so that leaves me at either tesco or shell for v-power.

I've compared v-power for 1200 miles and got *slightly* better mpg out of vpower but for me it wasn't worth the extra price over the tesco stuff and the shell garage is a bit out of my way.

I couldn't notice any difference in power between vpower and the tesco stuff but even if it gave me an extra 5% on vpower i doubt i'd ever notice that on the roads.

To take advantage of higher octane depends on a few factors though, the biggest being does you can have the ability to take advantage of it atall. second is that if you car can take advantage it can take several tanks before it 'learns' to use it. You can sometimes reset your ECU after filling up and let it idle for 15 mins to re-learn but it depends on the car.
 
The temperature drop between before October and now, combined with taking longer to warm up and defrosting, plus longer journey time from the weather would easily attribute that.
 
Yep, always use Tesco 99. Definite, distinct, absolutely non-imaginary increase in performance from Sainsbury's 97. Don't know about MPG - no trip computer and no desire to depress myself by calculating it ;)
 
Use it in the MINI all the time. Not because I think its better then Vpower or any other SU for that matter, but purely because Tesco is the closest petrol station between home and work.
 
So people are now saying that Momentum 99 is up there is V-Power?

I've noticed a slightly gain in MPG since starting to run V-Power, which is impressive considering the recently increased boost and complete change in driving style (before I used to try and conserve fuel - Now I don't :)).

I've been tempted to stick Momentum 99 in but everybody seems to go on about the economy gains rather than increases in performance. Personally I prefer more sprightly performance than a couple of extra miles out of a tank.

Is it worth a shot at the next tank?
 
It is obviously the case that if you do short trips, the cold weather will hamper your economy because the car takes longer to warm up and so a greater percentage of your journey is without the engine at optimum temperature.

But once the engine is up to temperature, I've always wondered what the effect on MPG is. Can somebody technical answer? If you were to drive 200 miles at 70mph with a warm engine when it's 20c, and then again when it's -1c, would there be an economy difference?
 
[TW]Fox;18046984 said:
It is obviously the case that if you do short trips, the cold weather will hamper your economy because the car takes longer to warm up and so a greater percentage of your journey is without the engine at optimum temperature.

But once the engine is up to temperature, I've always wondered what the effect on MPG is. Can somebody technical answer? If you were to drive 200 miles at 70mph with a warm engine when it's 20c, and then again when it's -1c, would there be an economy difference?
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I can't answer with much technical proof, but hot air is less dense so drawing hot air into the cylinder will need less fuel to combust for the same volume. Hence why cold air intakes arn't fitted to most cars from factory, there left to suck in the nice warm air from the engine bay which results in a lack of power but greater MPG.

Anyone feel free to correct me if im just talking out of my arse :D
 
Duke said:
Try several tanks - you need to give it time to adjust.
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Not really.

Every time I change my fuel or suspect my driving style is going to significantly change I do a manual hard reset on the ECUs. Usually everything adjusts itself nicely within a couple of miles :).
 
[TW]Fox;18046984 said:
It is obviously the case that if you do short trips, the cold weather will hamper your economy because the car takes longer to warm up and so a greater percentage of your journey is without the engine at optimum temperature.

But once the engine is up to temperature, I've always wondered what the effect on MPG is. Can somebody technical answer? If you were to drive 200 miles at 70mph with a warm engine when it's 20c, and then again when it's -1c, would there be an economy difference?
Click to expand...

Cold air causes issues with fuel atomisation at low throttle angles for port injection engines, you may need to inject more fuel than usual to maintain stoich using lambda closed loop.

Cold weather means more heater/lights/wiper loading.

Higher air density gives more power for lower throttle angles, on a petrol this will increase pumping losses as the throttle is not as open.

People tend to slow a bit more for roundabouts/corners which doesnt help. A good slip road exit can also cool the engine significantly.

Warm up is the main issue as you state, even including gearbox oil viscosity and the drag effect that has on autos.

Getting lean burn in mine is a pain in the arse in cold and stop/start stops so bit more of a difference that a usual car. Even if half the rad is blocked and I have a bbq roasting tray with holes infront of the condensor. :p
 
My S3 gets tanks of Sainsburys 97, Tesco 99 or VPower depending on where I happen to be at the time. All fuels give me roughly the same MPG but the car feels a lot more perkier on VPower than it does on the other fuels.
 
Here's a question to all the BMW petrol owners - 95 or 97?
I'm using V-Power on the Z3, but is it really worth the 10% increase?
(132p v 118p)
 
MaX_PoWah said:
Seems to make a big difference in my 197, i didnt want to believe it, but it does, and the people on some of the clio forums recommend using it too,
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can + that comment, use it in my 172 and the difference, surprisingly (I was adamant i'd notice NO difference) is massive.
 
Joshy said:
Not really.

Every time I change my fuel or suspect my driving style is going to significantly change I do a manual hard reset on the ECUs. Usually everything adjusts itself nicely within a couple of miles :).
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Ok not many can/will know how to do that :p
 
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