Originally Posted by crisfer
I have a luxury car does that mean I should never turn it off because I should be able to afford the gas??
Not quite the same thing.
TiVos are designed to run 24/7. If they're not recording your requested shows then they are recording Suggestions or buffering live TV. And with the advent of the Mini and the Stream they are also potentially acting as a host to one or more remote devices. Coordinating all that with some sort of power state that actually saves energy would be very difficult and depending on the usage pattern probably wouldn't save that much energy.
A 6 tuner Roamio only draws about 16W even when recording on all 6 tuners, so at the national average cost per kWh that's less then $20 a year for it to run 24/7.
If you're really frugal, or really power conscience, there is a member of this forum that has his TiVo connected to a lamp timer set to shut down from like 2:00am to 5:00pm every day. He says he never records anything between those hours and it's never caused him any problems to just cut the power like that.