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The large primaries on the dc header are hurting your low end torque. Couple that with a small exhaust and you have a recipe for abysmal economy. The stock manifold is where the economy is to be had. The exhaust after the cat converter isn't of any importance as far as economy is concerned.
I've also found that mid grade fuel and 1 to 2 degrees of advanced timing can help torque under 3k rpms, where it's most beneficial when trying to hypermile.
With narrow tires at sidewall max, proper shifting, and optimum engine tuning it should be easy to crest the 38mpg mixed driving mark.
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