H4.mpg Apr 2026

: The performance-tuned turbocharged H4 variant sees a drop in efficiency, reaching approximately 18 City / 25 Highway MPG . Community Experience & Reliability

: Most standard hatchback configurations with the H4 engine maintain the 20 City / 26 Highway MPG rating. h4.mpg

: Older H4 engines may require significant service milestones around 100,000 miles, such as timing belt replacements, whereas some newer or larger flat engines (like the 3.6L H6) moved to more durable timing chains. 2010 Subaru Impreza Outback Sport for Sale Near Me : The performance-tuned turbocharged H4 variant sees a