The Bonanza may not be so thirsty. My A36 flies fine, with 2 up, full tanks, at 150KTAS with 8 gph fuel flow, at 12500ft. WIth just 10gph, it makes 165KTAS at 10.000ft. And I don't make it lean of peak, because I still don't have the GAMIjectors.
The parts are, of course, expensive. The price tag, is also expensive.