Custom tune/With crappy MPGS

Hey just wonder has anyone noticed a huge MPG difference when you went with a Diablo sport tune? I went from the mid 20 to high teens when i went with the Diablo Sport K&N tune. I have a modified stock tune on now and now im back to were it was stock. Just curiouse. I aslo noticed a diff with my tuner and 03silverGts diablo tuner. Mine loads like a frickin snail to his. It takes like 30 secs to boot. Its a U7145 With the 9r03 update.

My MPG went up to 23mpg with my 09 GT with a SCT. Nice HP increase.
You need to see JJ @ Woodbine Motorsports to get your tune right.

K, Ill see if I can email him with tips or a price for a tune.

I have the SCT and bamachips tunes and mine stayed about the same, maybe a little better. And the car runs great.

I emailed JJ and he said to swing by and throw it on the dyno for a hour to find out. 135 a hour, Ouch. Wonder if he give military discounts?? or discounts to buddies??? hmmm

Yeah...JJ is not cheap but he is one of the best around and a pretty cool guy. Learned a lot just listening to him the other day at Bob's. Personally if I ever need a custom tune I think I will go to him. However you can get a pretty good tune from one of the tuners on the inter-web for about $75. Brenspeed, Bama, and a few others. I run Brenspeed tunes and I don't have any complaints.

Well i was readin a crap ton of forums a little bit ago and ppl with 4.0s are sayin there gettin 30 on the highway and down to 10 in the city. WTF are these things really that bad. Im going to chang plugs and put in the 87 octane tune and see what that yeilds me. No more firm shifting for me:(

JJ has been tuning my cars since 2005. I won't go anywhere else. He is nationally known for tuning Lightnings and Mustangs, and is a no nonsense kind of guy. His customer service after he performs work is second to none.

Your first tune with him is the most expensive, as it's usually the one that needs the most adjustment and refinement.

John