Xenocron and pherable are meant to only be used as a basemap. Their "tunes" are typically overly rich with a lot of timing pulled out to ensure your engine doesn't blow up. If you want to extract the most power out of it and have good gas mileage, it would be in your best interest to find someone to tune.

You can always street tune it yourself if you can't find anyone. Register with http://forum.pgmfi.org and start reading up if you are interested.