You've had it for five days. How do you know your loosing mpg?

I'd say you foot is killing mpg.

 

i put 513 miles on it with a business trip. ive been takin it easy around town and on the trip since my boss was with me.

 

race tune=max hp not max mpg
street tune= best for mpg but not for max hp

 

What octane gas are you running on Street Tune versus Race tune?
I know my car is tuned for 87 Octane right now, and I get 18city/27highway, but if I put 91 or 93 in it right now, my mileage would go down due to the timing not being optimal for higher octane.

 

Street performance and race tunes are for 93 since its pretty accessible around here.

Hmm maybe I just got some bad gas or something cause I got almost 50 more miles on the performance tune than I did street tune.

 

and is the race tune too hot of a tune to run as a daily driver?

Without seeing the tune file, it'll be difficult to answer that question.

race tune=max hp not max mpg
street tune= best for mpg but not for max hp

That isn't particularly true. The tune that creates the most power (with certain parameters aside) is the most efficient tune. These canned tunes just bump up the ignition advance as you go from your typical 87 octane "street" tune to the typical 93 octane "race" tune. For a stock or bolt on car they often net a little power increase, but being able to tune the car in person with a WBO2 is a far better approach. As far as fuel efficiency is concerned, there is quite a bit that can be done in the tune to improve mileage.

 

finished my first tank on the 87P bama tune and got 18.5 mpg with quite a bit of wide open throttle - mostly city. loaded the 93 race tune and going to drive it like a granny to see how well it can do.

 

++ let me know how that turns out for ya.