Since starting to do a few short journeys I find that on the odd long trips I get poor mpg. Nothing like I used to achieve. Today, I covered 108 miles of mainly dual carriageway with a few miles of country and single track roads thrown in (Average speed 39 mph max 63 mph). My ScanGauge mpg was only 46.7 compared to the 56 mpg I used to get.
On my return, the first thing I checked was the wheels for warmth. Nothing. The tyre pressures were my normal 35 psi (I check them regularly) and nothing else has changed. The car boot is empty and we were two up as normal. I cannot explain it. Because I fill up so infrequently I now use 97 RON E5 at every top-up.