I notice a significant difference in range when using poverty spec derv as opposed to the V-Power version. Depending on the right foot and traffic it can be as much as 60 miles difference on a full tank.
same on our diesel,so we only use shell now,but strangely, we used to use whatever was around in the rav4, BP,tesco,sainsburys, apple etc but then i had to put shell in as light was on, we always just chuck 30 quid in usually every friday, our mileage is almost every week very similar depending how many hospital visits swmbo has to endure,
its a habit for me to reset the trip every time we fill up,weird thing is following friday still had over a quarter tank instead of very low, and had noticed it had less pinking at low rpms in a high gear engine was very smooth on tickover and acceleration was crisper,so used shell again next time, and after 5 weeks of constant checking, it is giving us consistently better mpg,went back to bp and tried it for a week, not as good,so its now habit to use shell