Jeff wrote
the SR22 is fast compared to other planes with smaller engines, but compare it
to a plane with the same 310 HP engine, I dont think you will see much speed
difference.

what other planes out there have a 310 HP engine?

The 300 hp IO-550 is an option on at least the S-model Bonanza (and
probably many others). A friend of mine has one and I've flown it -
it's a great airplane, and it will comfortably cruise at 180 kts on
16-17 gph.

Michael