an other regen indicator is cruise around 55 and reset your fuel mileage if it jumps to 7-12 then starts to round to 10 then it's in a regen, and if its not it should jump to 14-27 mpg then round off to 17

or when you accelerate it will be very reluctant to boost above 20psi instead of 30 so easily when it isn't doing a regen.