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The 3-speed auto was dropped for the US market in 2001 (with the base VE, the only Corolla that had it); yours is a 4-speed. As Metro said, the only thing you've really changed from stock is moving to a lighter oil weight which won't net you much mpg gain (if it's measurable at all). The original EPA ratings for the car were 32 city/41 highway before the revision; my parents and one of my brothers have 2004 Corollas (both automatics) and regularly see 40+mpg driving normally, so I'm not surprised at a 39 mpg all-highway fill for yours. As for the drop, you already said why: city driving and extensive idling during the maintenance work. It was unavoidable, and the car will be better off having had the fluids replaced, so I wouldn't worry about it.
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