What Fuel Grade ??
- Thread starter Chris Smith
- Start date
According to manual, fuel requirement is in fuel tank flap. Also, manual says: "Super 98 / Super 95 (with a slight power loss) ROZ".
Personally, I won't bother with 99 RON, I only did it for my AMGs.
I downloaded user manual from Official Cupra website UK, but it seems to be gone now.
Personally, I won't bother with 99 RON, I only did it for my AMGs.
I downloaded user manual from Official Cupra website UK, but it seems to be gone now.
From the manual.
The correct grade of petrol is listed inside the fuel tank flap. The vehicle is equipped with a catalytic converter and must only be run on unleaded petrol. The petrol must comply with the standard EN 228 and be sulphur-free. Fuels with a 10% ethanol ratio can be refuelled (E10)2). The types of petrol are differentiated by using the octane numbers (RON) or via the anti-knock index (AKI). Super unleaded petrol 95 octane petrol or normal 91 octane petrol at least We recommend refuelling with super 95 octane petrol (91 AKI).
The correct grade of petrol is listed inside the fuel tank flap. The vehicle is equipped with a catalytic converter and must only be run on unleaded petrol. The petrol must comply with the standard EN 228 and be sulphur-free. Fuels with a 10% ethanol ratio can be refuelled (E10)2). The types of petrol are differentiated by using the octane numbers (RON) or via the anti-knock index (AKI). Super unleaded petrol 95 octane petrol or normal 91 octane petrol at least We recommend refuelling with super 95 octane petrol (91 AKI).
So what is everyone doing? Is any one running exclusively on 95ron? Are people fuelling using a hybrid of 95 and 97? I’m asking because I have been using 97 and 99 and can’t tell any real world day to day difference. So was wondering if a further drop to 95 for daily commuting would also be an option. I have a VZ2.
I know that the 97’s and 99’s will obviously be regarded as the “better” choices, but I I’m more interested in hearing about those running a VZ on 95, if anyone is, and their experiences. Thanks.
I know that the 97’s and 99’s will obviously be regarded as the “better” choices, but I I’m more interested in hearing about those running a VZ on 95, if anyone is, and their experiences. Thanks.
So I've covered 4k miles on a mix of both 95 and 99. I can't say I've seen any difference in performance or fuel consumption with either fuel. 95 Ron is typically Sainsburys unleaded, and the premium has been Esso 99+. I think I'll switch to standard 95 from here on in, particularly with recent price rises?
Thanks mate, appreciate your input, it’s good to hear of someone running their’s on 95 and not noticed any real life changes. Think my next fill up could be at the E10 pump. See how it goes.l’ll not be timing any launches or having the car Dyno’d, so hopefully won’t impact me to any significant degree.
Suspect the only place you’ll notice the difference between 95-99 and E5/E10 is on a dyno and it will be minimum.
Anything else is just subject to placebo effect and positive bias. For example someone anecdotally saying they got 34 mpg on a trip once at 95RON then they got 38 mpg on the exact trip with 99RON doesn’t really hold any value. That applies to pretty much any car on the road these days, even higher performance road cars.
Anything else is just subject to placebo effect and positive bias. For example someone anecdotally saying they got 34 mpg on a trip once at 95RON then they got 38 mpg on the exact trip with 99RON doesn’t really hold any value. That applies to pretty much any car on the road these days, even higher performance road cars.
Yeah exactly my thinking. Think I’ll stick 95 in on my next fill and see what happens. This has all been prompted by my brother swapping out his 2015 SQ5 diesel for a 2018 SQ5 petrol. His manual talks about 91ron being the minimum and 95 being the optimum fuel for that, and it’s a V6 354bhp beast. So got me thinking about the VZ2.
cheers for letting me know your thoughts.
To give you some background on the choice.
What is here important are 2 things: the mentioned anti-knock index and compression ratio of the engine.
The more CR engine has the more likely an unintended self-detonation of the fuel can occur (think of a diesel). It is deadly for the petrol engine so it is constantly monitored and to mitigate this there are 2 choices: increase the AKI of the fuel to whitstand more compression or accelerate ignition by the ECU. The latter has negative effect on the power output and maybe emissions.
CR of turbocharged engines tend to be very high as it is also the case for VZ310. It has nothing to do with power output. A 500bhp naturally-aspirated low CR engine could run on whatever fuel.
Theoretically it is save going for 95 in VZ310 in terms of engine damage thank to anti-knock sensors, but in some extreme cases if knocking occurs, the power output will be reduced. The real problem is when you tank eg. 91 and the ECU goes out of available adjustment treshold, the damage can happen.
What is here important are 2 things: the mentioned anti-knock index and compression ratio of the engine.
The more CR engine has the more likely an unintended self-detonation of the fuel can occur (think of a diesel). It is deadly for the petrol engine so it is constantly monitored and to mitigate this there are 2 choices: increase the AKI of the fuel to whitstand more compression or accelerate ignition by the ECU. The latter has negative effect on the power output and maybe emissions.
CR of turbocharged engines tend to be very high as it is also the case for VZ310. It has nothing to do with power output. A 500bhp naturally-aspirated low CR engine could run on whatever fuel.
Theoretically it is save going for 95 in VZ310 in terms of engine damage thank to anti-knock sensors, but in some extreme cases if knocking occurs, the power output will be reduced. The real problem is when you tank eg. 91 and the ECU goes out of available adjustment treshold, the damage can happen.
Deleted member 131219
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There is certainly a ‘warm feeling’ about using high octane fuel, it gives a strange sense of satisfaction, but in reality there is no genuinely advantageous reason to do so (you won’t make up for the extra cost in MPG, nor will you notice a power increase, except for the aforementioned placebo effect).
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I buy cheapest 95 petrol. Using supermarkets and other brands randomly. I don't have petrol station in town, so I buy it when needed, in different locations.
Mate I think if I could afford to fuel up on that without thinking, I’d be with you, but the price premium is just too big for me. Also if I had bought and not leased, that would also be influencing my decision too.
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You make a good point; my cars are bought, so I always have an eye on their long-term preservation. As for the cost aspect, even before the pandemic, my annual mileage was relatively modest (typically 9,000 miles a year). so the marginal cost of using V-Power over decaffeinated is a tiny proportion of the overall costs of ownership and usage.
That's why my owned AMGs were always drinking Momentum, but my leased Audi S8 never seen anything above 95.
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