SR22 pilot reported engine fuel flow and power loss in cruise and a diversion was necessary for a safe landing.

Narrative

Normal climb initially; then first indication of low fuel flow approximately 10 minutes into the flight. The aircraft had a recent history of fuel flow and manifold pressure indication issues and was just tuned/checked/cleared at a Cirrus maintenance facility in ZZZ3 2 days prior and following 3 visits within a few weeks to the Cirrus maintenance shop - at my home airport in ZZZ1 for the same reason; including the replacement of the propeller governor. I decided to carry on with the flight and monitor all indications to better assess the issue; and started developing alternative scenarios. Fuel flow indication (GPH) dropped to the mid-20s in climb while on normal power settings of ~100%; normal RPM indication of 2;450 and normal Man HG pressure of ~35 (fuel flow on full power climb should be closer to 40GPH). The manifold pressure indicator then started showing rapid variations up and down; including in the yellow/caution zone; the fuel flow indicator dropped further to ~22GPH while on full mixture and climb setting of 100%; well below normal/expected. I reduced the power setting to keep the manifold pressure in the safe/green range; probably around 80%; essentially moving to a cruise climb setting. Climb was slow; but oil pressure and temperature were all within rangeAt cruise altitude of 7;000 the aircraft accelerated to normal speed. Approximately 10 minutes into the cruise; the indicated cruise speed started dropping slowly with no change in power or mixture setting (80% power) and fuel flow in the green range. Within 5 minutes; speed dropped by ~40 KTS. I called ATC to advise that I was unable to maintain filed speed of 175 KTS. I believe I gave them a 140 KTS. new speed; which was the indication when I made the call. Within another few minutes; the airspeed dropped to close to VREF (30% above stall speed); getting closer to stall speed. Loss of speed was at constant power and mixture settings; indicating a loss of engine power. I called ATC and asked to vector to land immediately and they pointed to ZZZ which I had just passed. I had an earlier exchange with ATC a few minutes prior; asking for vectors to ZZZ4; where a Cirrus maintenance facility is located; ATC had mentioned the ZZZ option if needed. Before I could get the vectors; I realized I would not make it to ZZZ4 and asked ATC for ZZZ landing. I initiated an immediate descent at idle power from 7;000 ft.; dropping quickly with the field just under me. ATC switched me to ZZZ Tower; and I was immediately cleared to land. Emergency vehicles were lined up. Tower asked if I needed equipment to get me off the run-way upon landing; and thinking I would still have minimum power to taxi; I declined. Gliding towards the field on short approach into strong head winds (I believe it was gusting close to 40 KTS.); I attempted to add power to avoid a stall and there was little response. I dropped the nose further to avoid a stall and make the threshold and felt that my ground speed was becoming idle into the headwind. I made it to the threshold and trying to land softly; the aircraft stalled and dropped on the runway in the last few feet. Landed on the main gears hard; and I am guessing from approximately from 10 ft. I could taxi (with difficulty; felt like little power). Personnel checked me from the outside and cleared me to taxi to the FBO where I was met by authorities. No injury. Visible damage to the main gear fairings; right and left. Under cracks on fairings; apparent damage to one the brake disks. The aircraft which is just one year old is under the Cirrus nose-to-tail warranty and maintenance program. The service manager is now in charge of assessing damage and addressing repairs. I believe an inspection was performed at ZZZ and a parts list is under development. I expect to hear more details this week.