[SIM EF6]

Hey I was just wondering what people here tend to put in their cars. (specifically the MPFI 4.0 Litre 6).

Reg Unleaded?
Premium Unleaded?
Optimax?
OTHER?

thanks

 

[Donut King]

Not in your range, but I put regular unleaded in my Carbied XF, am thinking about doing a trial of optimax.

 

[HSE2]

Right now Vortex

 

[Aussie Falcon]

Mobil 8000

 

[FM]

Haven't got a choice.. Regular Shell. Card doesn't allow Optimax..

 

[XR_Strider_GuY]

What i pu tin my baby, Vortex for daily running (quite affordable) and Synergy 8000 if i need abit of a power boost...

 

[jaytyn]

When I use regular unleaded in my AUII falcon, fuel consumption is absolutley ****. I get 350kms to a tank around town.

So, I have been using Optimax, which increases my distance to a tank to 450kms. No bull ****.

When I had my KN Laser, Optimax made NO Difference to fuel consumption.

Either My Falcon just DOES NOT like regular unleaded, Or the servo is diluting the fuel some how!...

Fuel consumption has gotten better after the engine has worn in more.

 

[HSE2]

Jaytyn There has to be something wrong there. 100km difference between fuels around town! The sixs have a knock sensor don't they. Your computer must be doing something wrong on the normal stuff. 350 around town is nearly as bad as Laminge

 

[Aussie Falcon]

I get 350km (inner city driving mainly), when the 80km warning beeps start on the trip computer.

Anyone know how to silence the beeping? gets a bit annoying after a while.

 

[Aussie Pete]

Our EA 30th Anniversary MPFI had it's fuel card incorrectly set to premium unleaded (he he he). It used to get around 11l/100 on the highway. Then the company woke up and reset it to std fuel. Consumption went up to 11.8 average. Better throttle response with premium too.

With the cost of fuel these days, I use std all the time unless the car needs premium. Otherwise it's Optimax only. ALways used Shell Premium, always will. Just a hint, when I was racing years ago a bunch of us did dyno testing of fuels and Ultra Hi won out over the rest. Last year CSV recommended that owners use only Shell fuels (apparently for the same reason).

 

[Venom XR]

I used to put BP Premium in the old car, as the difference between std. and premium was 3-5c at the servo near where I lived. When that changed, and the difference was that of other fuel companies, I switched to Optimax. I don't drive to and when I do big trips premium gives better fuel economy, so I only plan on putting Optimax in the XR while I'm driving the beast.

 

[FM]

Anyone know how to silence the beeping? gets a bit annoying after a while.

Fill it up with juice.. Sorry, I couldn't help it..

 

[Guest]

i use 2 fills regular and the third fill is premum

 

[batbo6]

Ive been using Mobil 8000 since new in my std I6 AU2 Auto. Ive now done about 1400km and the economy and power is below average.
The last fill I put in 37 litres and had travelled 210km (city cycle). Thats about 20l/100k. :thumbdown
Because the car is still so new, I'm taking it pretty easy but I'm hoping the economy will improve with age. (soon)
Going by these figures I couldn't recommend the 8000 to anybody considering the extra cost involved (5-7cpl)
I also have an old hack KA Laser auto (bought for $250, 2 years ago) and I use Optimax religeously. I notice the engine runs smoother with more power and better economy. :thumbup:

 

[VilkasMaximus]

I stick to Optimax or Mobil Synergy 8000. Have done so since both these products have been out, before then I used premium.

First time I used premium was in an EL Futura I owned back in 97 that had a 5.0l. I noticed a difference in performance, so I stick by the higher octane fuels. I don't know about this Vortex stuff....

Jas

 

[jaytyn]

Ian, yep something does look wrong there with that fuel consumption.

I must ask our service manager about it, i'll let you know what he says.

 

[jaytyn]

mbrown, your high fuel consumption sounds very similar figures to mine.

Why dont you try a full tank of optimax and let me know the results. It would be interesting if your consumption goes down on this fuel.

 

[laminge]

Optimax is the go

Tries the other stuff but under heavy load everything else PINGS BAD.....

Optimax is the only stuff that runs smoothly throughout the torque range

 

[HSE2]

Ian, yep something does look wrong there with that fuel consumption.

I must ask our service manager about it, i'll let you know what he says.

We had a company car do something similar and that was traced to the computer. The fuel just shouldn't give you that much extra.

 

[bobr]

mbrown and anyone else getting heavy fuel consumption from their I6...

Have someone check the O2 sensor - they have a bad habit of dying quite regularly and even brand new they can be duds.
I had exactly that problem with my AU XR6 - replaced the sensor and much better - around 400 - 450Ks per tank around town and anything up to 600 or more out of town - and I'm not light on the right foot either

BTW I use regular ULP most times, Caltex/Ampol PULP when I want some more go...:thumbup: