I've been doing a bit of experimentation with fuel consumption since getting my 3.2Q Sline. Heres what i've found. All recorded over around 100miles with 80mph ish average speed on a motorway. Shell Optimax 30.0mpg Texaco Super Unleaded and BP Ultimate Unleaded 27.6mpg Stanard 95ron Unleaded 25.4mpg Anyone else noticed similar results? is Super Unleaded/BP Ultimate 98ron? Is Shell Optimax 98ron?