Fuel type & MPG

[wickedmonkey]

I commute 17 miles each way every weekday (with the odd exception like gale force winds) and do some riding at weekends to the shops and occasional visits to friends. I use the same route work 99%. I pretty much always fill the tank up to the bottom of the filler spout almost always after the fuel gauge is down to nearly empty.
It could all be in my head. I *thought* that the higher MPG on fuelly was preceded by filling up with premium but a quick look shows that that is not consistent. It could also be down to getting more confident and riding smoother even though I've been pushing it a bit more with increased confidence and better weather. Maybe my gear selection is improving. Either way, if it helps keep the engine clean, then that's a bonus.

As an experiment, I might fill up the next few times with standard unleaded and see if I see a difference on fuelly.