I have an 80 AMP charger on my older p85. Its awesome but now that I have a Supercharger in my hometown the need is almost nill. Driving all day and then wanting to get out of town and go up to the mountains we would have to wait at home until we had enough to get up the hill. Charging at 60mph (80amp) was pretty darn nice compared to 30mph (at 40amps). But now, if we are getting out of town I just stop for 10 minutes at the Supercharger to get me up to the mountains.