Maybe you have what I call a Monday engine and the rest of us have Friday engines!Maybe I need to start hitting it a little harder on the pedal haha My max was driving to Germany when I got 440 out of a tank with 4 people in the car, although that was mainly cruising motorway driving.
Sorry to bring up MINi’s again, but the Supercharged S’s where Wildly variable on power from the factory. Mine was pushing 240hp after a few simple upgrades (pulley, filter and cooler) where others having spent ££££ weren’t even getting 210. My friend Graham sorted his with an adjustable cam sprocket to better adjust the timing for the remap by West Tuning.
So those getting 400 miles must have a Monday engine and be getting 320hp too lol