As reported in the rare and odd workings thread, 1408 was working the X14 today.

All in all I couldn't tell if the vehicle was coping well or not, As the driver was one of them Eco Mad, Slow , Never makes up time drivers, So didn't push the bus at all.

Though around Cragside/Rothbury, Where the bus has to climb 25% Inclines, It coped well and Econospeed didn't mess the Gear changes up during the climb up either.
Though on the straight sections the driver didn't push the bus, Getting up to about 40mph at the most.

One suggestion is that if these vehicles were to operate the route, The Econospeed setup needs to modified in 3rd and 4th Gears, Fast Hills climbs needs a downchange around 30mph to maintain climb.
All in all it coped well, Even if the driver didn't push the bus at all during the journey.