(06 May 2015, 5:26 pm)Tommy_1581 wrote Which ones? A few of them don't have Econospeed enabled on them at the moment.
7522-33, 7517 (not sure if that has it), a couple of others as well from the 09 batch, and maybe 7513 (can't remember if I'm honest, it was either brilliant or rubbish, was that long ago)
(and I imagine if 7522-33 are fine, 7534-40 will be)