I wonder how head-wind factors into that as well, I know on our EV I can easily see 10-15% consumption difference if I run into a strong one at freeway speeds.

Wind will always affect flight speeds regardless of configuration. To use physics terminology, the air around you becomes your frame of reference. 10kt tail wind and 100kt True Air Speed = 110kt ground speed

A SR-20 has a single engine at the front of the plane rather than 36 scattered over the wings. They claim, at least, that that makes a big difference in aerodynamic efficiency.

It does in some cases (see NASA X-57 where the fan is used to accelerate air over the wing, leading to a smaller wing with lower drag overall) but I'm not convinced in this case. Having a system that is efficient at high airspeed and high thrust generally requires a variable geometry propeller (constant speed prop in GA terms) because a 'lift fan' at high relative airspeed, would have to spin much faster than a 'cruise fan' like you would see on a regular aircraft meaning airflow over the blades is higher leading to higher drag on the blade than necessary.