focus LS-LV pinging

[DeKa]

My LV will ping on 91. It's mostly fine on e10 from Woolworths/Caltex and shell which is 94. It doesn't ping on 95 or 98.

I get the best fuel economy on 98, but only 0.2L/100km over 95, so 95 is far better value.

Here's a graph comparing 35000km worth of fuel consumption figures. There are at least 5000km worth of driving on each fuel except 91 where I only did about 800 (2 tanks) due to pinging.