About the same if not better than the manual on MPG as it changes up gears when you may not.
Please remember today's automatics are NOTHING like the old ones.
What you have is a manual gearbox with an electronic selector changing the gears for you, the clutch is an electronic actuator pushing the clutch arm.
There is NO torque converter, no auto-box, no transmission fluid to pump round.
It is in effect a manual that someone else is working for you.
Can you change gear quicker in a manual? yea you maybe able to, does you left leg ache on the M25 ? Mine don't
Its swings and roundabouts, I drive BOTH, but she only does auto`s so we have auto (have done for 4 cars now, with the electronic box)
Just before someone adds comments about snow/ice, my car was only one out of our road last time it snowed (Focus Diesel Auto) LOL at manual BMW stranded.
BTW take a look at Auto-trader RCZ MPG listed as 38.6 Auto 42.1 Man so not so shabby 4mpg less (£150 over 12000 miles)
Paul141