Fuel Econ in WJ V8

[PK]

I wouldn't bother - virtually no cost saving, and from what I've heard, worse economy (but I could be wrong on that).

There would have to be a significant saving if I was going to use it in any of my cars.....

[bikemat]

by blended do you mean blended with ethanol?
from everything i've heard ethanol raises the octane rating of the fuel = more power and efficiency and it's also cheaper and cleaner
I know the V8 is fine to run on it

[Roachy]

As I understand the differance between the 98 & 95 ron fuels is that the 95 dosn't have the cleaners in it (nor as higher octane rating) so doubt if the is any real benifit over normal regular unleaded - you may as well go to 98 ron and get the benifits of the higher octane and cleaners etc. I run 98 (normally optimax) and get around 15-16L/100km around town and 12-13 on Hwy. I have a K&N filter & 2.5" mandrel exhast with a high flow cat back muffler (boy does it sound better that the stock). That said I seem to remember getting better fuel econ but I think that I have a dud O2 sensor and am about to replace them all (am just waiting the part to arive from the US).

Cheers

[Cpage66]

Mine REALLY likes the new Optimax Extreme 100 octane...!

[Roachy]

Cpage66 - what sort of fuel econ are you getting?

[krankieone]

Originally Posted by bikemat

by blended do you mean blended with ethanol?
from everything i've heard ethanol raises the octane rating of the fuel = more power and efficiency and it's also cheaper and cleaner
I know the V8 is fine to run on it

yes it is fine to run BUT ethanol has a lower specific gravity(SG) than petrol so you get less power per litre which is why you may get a slight inrcease in fuel consumption and why they test the SG of fuel for race cars in certain classes with restricted fuels

[bikemat]

How does specific gravity affect it???
All the tests i've seen say it gives better economy