My Vette is also in the upper 20's for highway mileage but I put it down to gearing and areodynamics. At 65mph the Vette is only turning 12-1300 RPM, hardly over idle speed and "sipping gas" while my PT is up around 3000 RPM pushing thru the air as Hooligan put it "like a brick".
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 ...just CREWZIN along! ® . . . PT Cruiser Links Moderator 
2000 PT. Original Owner, 110,000 miles
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