This is more of an observation than a complaint so….
I went from a couple of R53 Coopers (slightly modded) to a F56 (2019 JCW Knights Edition - all stock) all have been the standard trans.
Has anyone else had the experience of a drastic increase in fuel consumption at sustained higher RPM’s (and speed) in the F56 vs the R53? I’m talking at speeds in excess of 100 mph over several hours. (In theory, of course. i would never knowingly break the speed limit.) I make the run between Tulsa and Dallas often and could do it in one tank of gas in the R53’s but I usually have to stop for fuel with the F56. At one point, I noticed the current consumption at 13.8. It averaged around 17.
Running the posted speeds returns better overall mpg when comparing the two but it seems that that B48 engine gets more thirsty if you really lean on it.

 

In my brief experience on MINI club runs, the R53 owners used significantly more fuel than I had with my F56S and my F56JCW's. The B46 and B48 engines develop peak torque at much lower RPMs than the old supercharged engines and driving a B46 or B48 F series at anything above 5500 RPM is a waste. If you look at past road tests of the cars, the F cars outperformed the old R53's in both acceleration and economy.

 

That’s what I would think. I haven’t done an exact comparison but I’d imagine the tank capacity is about the same. I can’t figure out why I can’t do the same trip the same way without having to stop for fuel.

 

You might be wasting gas stretching out the rpms. At over 5500 rpms. the engine makes noise but the acceleration is anemic. The B46/48 have great torque and very little lag at 3500 - 5500. I would think that is the zone you would want to use on a tract for a stock JCW.

 

Mitch,
The tank capacity was reduced when the model F56 came out. The R56 held 2-3 more gallons. I am not sure about the R53's.

 

The R53 does indeed have a larger tank, by almost 2 gallons.

I typically set the cruise around 100 in my F56 with a tune and see low 20s MPG-wise. 100 is right around 4,000 RPM.