I would say clearly it is not as the 180 kw battery is limited to 95 mph which is clearly not a motor limitation as the motors can take 300kw. The generator is only 175kw, so I would say that without battery supplemental power to the motors 125 mph is not sustainable for indefinite periods. It is 30 more mph, and is motor limited so 300kw-175kw would leave a load of 125kw on the 20.1kwh battery which it could sustain for just under 10 minutes. I would guess you could drive 90-95 mph indefinitely until the gas ran out.