After looking at the math involved I have to say, rather you than me! haha. That would be very kind of you, thanks.
*Just saw your next post.. err.. umm.. err..
I could tell you all about fabricating car components and maybe wiring the headlamps, but I couldn't tell you I know how that circuit works
if it puts the most power reliably to my heating element and my readout works then yes, that's perfect..
I followed it far enough to assume r3 is my kanthal resistor, s1 my switch. The way the mosfet looks alien to me but that's no surprise, I'm used to seeing the actual wires etc.
If that's, in your professional opinion, an efficient circuit I'd be more than happy to use it. You wouldn't happen to have the part numbers of the components would you?