My bike does 44mph without pedalling nearly every time I go out for a ride. You should come to Telford if you want to go faster.
@soundwave wants to go faster generally, not me. I've been trying to get faster on the flat to keep up with slow moving traffic, after I've had a nice rest letting the motor do nearly all of the work up to 25kph. After a lot of slow squats to increase leg muscle size and strength, and fast tiptoe squat hug knee leap land softs:
https://www.pedelecs.co.uk/forum/threads/the-anything-thread-that-is-never-off-subject.46613/page-6#post-709498
... which were infinitely easier to do aged 18, and to a higher altitude, landing as silent as a Rinja! HAI! (the correct pronounciation [I shout this out each time]), I can now maintain 18 to 20mph for a few minutes, and near 22mph bursts - not a patch on the lycra lot, who overtake me all the time regardless of what I'm attempting. Loads of nice hills near Telford, which I spotted once from Shifnal. My brother had a very nasty accident downhill cycling in the considerably more insane North Wales, he's lucky it didn't kill him. Splatted into a big jagged vertical rock.
If my battery continues to not explode continuously discharging 18A, I might increase the controller limit to 19A or 20A, switch off half the lights (1A?) and install a larger chainwheel. I should be able to continue hauling trailers of the same weight uphill, but be faster in among slow moving traffic, as my Rinja! HAI! high leaping silent landing skills improve in altitude and duration. On the other hand, all that leaping about is bloody exhausting these days, and might kill me faster than a Tesla runs me over, while the driver plays Pokemon and sends dick pics to Angela Rippon.
My knees are killing me, so I might not do anything to increase speed on the flats at all.
I was more interested in faster low effort hill climbing speed. I've avoided this hill ever since the goons gave chase on foot uphill, and unhinged screeching "Shall we grab ya? SHALL BE GRAB YA?!?!?" from their goon mates overtaking by car. Fortunately, my bike looks weird and cheap.
Easy hill climbing speed has increased: