Im looking for a tuner/someone whose been tuned with a stock I/H/E gsr thats tuned on crome and get better gas mileage to send me a chip...im averageing 26 on the hwy and just did a full tune up...

 

Would be a waste. Altitude changes all over the world. Better off to tune your car. Stock p72 .bin runs 14.1 afr cruising on my jdm b18c type r. I ran as lean as 16.1 with no detoning.

Stock ecu are rich for that safety.