I hear you TokoyoGTR!
Jacey, got 25mpg up the M6 with delivery mileage at the usual outside lane "making progress" pace.
Seen a steady 30mpg @ a steady 110km/h. LOL ;-D
Commuting into work with a light "run-in" foot but the odd squeeze to 3500rpm limits, I'm seeing 21mpg.
About to enter the 600 mile + run-in with 5000rpm in 1st, 2nd and 3rd... so that's the last time I'll see 20+mpg.
Expecting 16mpg from now on until the 1200 mile inspection and then full beans... & "Show me the whole thang!".