BP98 is the only fuel my ST doesnt knock on heavy loads. Like 4th gear roll on at 60 coming onto boost. Has more than enough tourqe to move itself effortlessly at that speed/gear. Stock tune as well which is poor effort on ford globals part. sh*t you not its like they tuned it for premium and they rely on knock control for lower octane fuels. Even though says e10 compatible on the fn fuel door.

Mate that doesn't sound like a fuel type issue that sounds like a an issue with the car more than anything
A factory car should not be knocking on any fuel it's rated for

On 9 July 2016 at 3:43 PM, k31th said:

stock?

 

O2 sensor, is my guess.

Blocked cat can cause issues, but would have to be fairly damaged/blocked/collapsed to cause bad fuel consumpion.

 

On 10 July 2016 at 8:48 PM, MattyP said:

Mate that doesn't sound like a fuel type issue that sounds like a an issue with the car more than anything
A factory car should not be knocking on any fuel it's rated for

Hey guys thanks for your replies on further investigation I'm getting 17.8/100klm not good

Hey guys thanks for your replies on further investigation I'm getting 17.8/100klm not good