[Lawsoc]

Hi does everyone fill up with super unleaded ? Cheers Claire

[JiggyP]

Yep

Always been a big fan of V-Power even before I bought the i8.

[Maxxsirrah]

No, but i do every fourth or so fill or if i know i want to push the ponies 😁

[skinrock]

I have the choice of ACN 91 or 100 for 7+/gallon.

[Mightymousemighty]

Originally Posted by JiggyP

Yep

Always been a big fan of V-Power even before I bought the i8.

Always v power no exceptions

[Aye-eight]

98 at the minimum. 100 or 105 if available. A few bucks price difference is not worth taking any risks with the eninge, in my opinion. In particular, because the engine gets used differently in a hybrid car: it gets called into action out of the blue and has instant load on it (e.g. when you're overtaking or going uphill and the e-power isn't enough).

[damian1M]

I will always use 98+ fuel whenever possible.

Is there any benefit of using higher quality electricity? I've noticed that charging the car using 99.9999999% pure copper cable and ensuring that the power I use has been generated from the newest nuclear power stations makes the car go faster for longer. This might be a purely placebo effect

[NGR]

I always use high-octane (preferably Shell V Power), not worth skimping on a few quid especially on a small tank like the i8.

I saw an episode of 5th Gear a while ago testing high-octane fuels, basically the conclusion was use it if you have a turbo-charged or highly tuned machine - you will gain power over low-octane fuel. Don't bother for a normal hum-drum car though, you won't notice except in your bank balance. I think they were testing on an Imprezza WRX or similar and rolling-roaded it to test for power and torque with different fuels.
It's on YouTube somewhere, worth watching.

[JasH]

V Power only, when possible, in any of my sports cars. Otherwise highest octane I can get.

Family cars get cheapest fuel available though.

[Amgeater2]

Have anyone done some 93 + some e85 mix ?

if you do 2 Gallons of E85 and 8 Gallons of 93 then we get,

10.00 gallons Total
95.4 octane
25.0% ethanol (or E25)

[tkar]

Funny my BMW dealer told me only to fill up with super unleaded every third or fourth fill, wasn't sure about his logic.

[NGR]

Originally Posted by tkar

Funny my BMW dealer told me only to fill up with super unleaded every third or fourth fill, wasn't sure about his logic.

Would be interesting to see if there is any logic behind it.
My understanding is that the super unleaded is just a cleaner fuel compared to regular therefore more oomph per liter as less impurities.
The car alters timing, fueling, boost pressure and whole lot of other things dynamically depending on conditions such as fuel quality, temp, load, throttle request etc... so can't see why using a lower quality fuel would be a good idea (although unlikely to be a problem either).

[tkar]

His reasoning was something along the line of its only a small engine from a mini so it won't make a difference but if you want to just fill it every third/fourth time with the premium stuff.

I think I'm going ignore his advice and just go super unleaded as standard

[phoenixcsl]

I always use super unleaded in mine (V Power), always have in any performance car i've owned.

It could be placebo, but on normal fuel the car doesn't feel as spritely.

Having said that, mine has been re-mapped so running super is a must now.

[YWGT3]

On average, the fuel tank is 75% filled with 101 octane and 25% V power (ACN91), for the additives.

[NGR]

Originally Posted by tkar

His reasoning was something along the line of its only a small engine from a mini so it won't make a difference but if you want to just fill it every third/fourth time with the premium stuff.

I think I'm going ignore his advice and just go super unleaded as standard

It is only a small engine but it's highly tuned - the power per litre is very high so high octane is very relevant as engine knock can be a damaging problem for such engines although only on high-boost when you're thrashing it or if you've remapped it for even higher boost.
The knock sensor and software will protect it on lower grade fuel but you will get more power from higher octane fuel.

To give you an idea of how tuned the engine is, a 5 litre with similar bhp per litre would output 733BHP!

[Aye-eight]

Originally Posted by Amgeater2

Have anyone done some 93 + some e85 mix ?

if you do 2 Gallons of E85 and 8 Gallons of 93 then we get,

10.00 gallons Total
95.4 octane
25.0% ethanol (or E25)

Sounds like a bit of a hassle. Can you even do that on the same pump? I thought once you put the nozzle back in, the pump shuts down and waits for payment. Are you then doing another pumping session, for just two gallons?

In Germany (for instance), it's still mostly "pay inside" - so this would be a real time killer.

But then again, pretty much every gas station here has at least 98.

[YWGT3]

Originally Posted by Aye-eight

Sounds like a bit of a hassle. Can you even do that on the same pump? I thought once you put the nozzle back in, the pump shuts down and waits for payment. Are you then doing another pumping session, for just two gallons?

In Germany (for instance), it's still mostly "pay inside" - so this would be a real time killer.

But then again, pretty much every gas station here has at least 98.

Unfortunately, it is a hassle for those of us who live in California, where most pumps offer 91 Octane at best. While it may seem silly, admittedly, I do go to two stations to refuel. Most of my tank is filled with 101 Octane and the rest of it with V Power, for its fuel cleaning additives. Although this may seem like a hassle, trips to the pump for my i8 have been infrequent in contrast to the other performance cars I've owned.

[Amgeater2]

Originally Posted by Aye-eight

Sounds like a bit of a hassle. Can you even do that on the same pump? I thought once you put the nozzle back in, the pump shuts down and waits for payment. Are you then doing another pumping session, for just two gallons?

In Germany (for instance), it's still mostly "pay inside" - so this would be a real time killer.

But then again, pretty much every gas station here has at least 98.

oh I see, no here in S. FLORIDA I have the convenience of doing the above mention combo at the same pump. now keep in mind that I do have to pay/swipe my card twice, once for gas and another one for e85 a bit of a pita but not that bad an extra min or 2

[NorCali8]

I8 Manual says min oct 91 recommends 94 ( max 91 at most CA pumps) I use a mix of 91 and 100 runs smoother and is more responsive. If the car sits for 2 weeks it is a little rough starting on 91 only. I didn't see much difference running pure 100 octane. I haven't tried e25 but the 91 is e10 from chevron. I like the Techron in chevron gas keep fuel system clean.

[Aye-eight]

I'd just go 100 all the way. I mean, c'mon - it's not like you're driving a Malibu, where the full tank is worth more than the whole car...

[iHyperMiler]

Is everybody here keeping in mind that the RON number quoted on European gas pumps is about 5% higher than the US number (RON+Mon/2)? I.e. US 93 is Europe 98, US 95 is Europe 100 etc?

Just askin' ...