Hi Neal, the av speed from the section of VeloViewer that I showed is slightly misleading. Most of the rides have been ridden along side a pedal only mtb rider.
There are a couple of higher ones in there which were ridden on my own, and also some in the 9-10mph bracket, which were ridden on my own, but in very varied conditions.
The biggest hit on average mph has been the Hutchinson tyres. They are absolutely phenomenal off road in muddy conditions or on wet slippery roots, and by far the best tyre that I have to date used, but boy do they zap the power and drag. I really do struggle to maintain any kind of speed above the bikes legal cut off, and find myself riding at a fraction below it, which is irritating. On the road, my mate on his pedal bike, just leaves me for dead. Battery life/range has also been hit, as I'm having to use more assist than It might otherwise have done.
I'd certainly say that our average ride mph are still pretty close though, so with your asthma and my knee, we are a fairly evenly matched team.
It's too wet right now to make things pleasurable or even worthwhile, but when things improve, we will have to drag SRS out, and go for an amble on the South Downs.