The only issue with an M20 series is the initial cost. looking at $80,000+ for something halfway decent.... I technically have a 172 with glass cockpit that would be a dream to fly. I typically burn close to 14gph in the 172. Time I have, so something around the 106 knots would put me at roughly 8.5 hours each way. I'm ok with this if the fuel can be around 5gph and have super inexpensive maintenance.
Wife and I have considered a cessna 210 with struts as you can find those in decent shape for around $50,000. Doesnt exactly fit the need for the fuel economy but it would allow us to fit our 9 million children for the trip if we wanted. Flight time is around 5.5 hours in that plane with fuel being the same as the 172 I currently have.
RV6 has been a strong consideration as well but its right in the price range of the 210 and about the same fuel burn. It's looking like a cessna 150 is about the best fuel burn/price for the plane... $20,000 for the plane and 5.6 gph.
Is there anything that can come close to 20k for the plane and 5.6gph?