Cessna 150 pilot reported an engine failure on final approach due to fuel exhaustion. The pilot evacuated the aircraft safely in a soft grassy area short of the runway.

Narrative

During flight planning; an expected 22 kt average headwind was expect along the route at 4000 feet; expecting an approximately 3:00 flight time. Cruise performance expected a 5.5 GPH fuel burn. In flight; ground speed indicated approximately 70 kts; which indicted a wind just slightly higher than expected. As the route progressed; the headwinds continue to increase far beyond that forecasted. As I entered my reserve fuel I became concerned while direct the IAF for my destination. My ground speed had dropped to just 35kts. I did a calculation and determined that would arrive with minimal usable fuel left; and decided to divert to ZZZ for fuel. The airport was close to my destination; but the extreme headwinds had pushed me beyond my comfort and I was almost right at the IAF for the RNAV XXR at ZZZ. I was cleared for the approach and switch to tower; I broke out well above minimums at about 1800 feet; and switched to land on XXL for convenience of where the FBOs were. On short final I was surprised by the engine sputtering and losing power. I was able to glide and land in the grass safety area; probably 100 feet short of the runway without damage. Flight time at that point was approximately 3:40 and should have still had 5-6 gallons left in the aircraft (2 usable). Clearly the aircraft had burned significantly more fuel per hour than expected. The aircraft was borrowed; and I did not realize the performance was so far off from the POH. That combined with the unforecast extreme winds led to the incident. I should have made the decision to stop for fuel sooner.