Advanced Engine Timing Imrpove Fuel Consumption?

[GUNN]

Will advanced ignition timings and higher octane fuel improve average MPG?

 

[edde]

Yes.

But realy you need higher CR to help as well.

 

[GUNN]

is 9.2 : 1 considered high?

 

[Fred@BTM]

not by modern standards no!

 

[edde]

is 9.2 : 1 considered high?

With the ngine effiency added into that nope.

 

[MrMark]

What do most modern petrol engines run at then?

 

[Fred@BTM]

depends on what the engine has been designed for, the NA renault engies are 11:1 and up

even the megane RS (turbo remember is 9:1)

 

[Dan@SJM]

10:1, the 172 runs 11.1:1 iirc or 11:1