If the seat bottom sinks way down when you sit on it, you might want to consider the pool noodle treatment as well as adjusting the angle. It can make a world of difference and its cheap to do, presuming you don't pay for the labor.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma