Hey there, I don't have any experience with the gas products but I took this directly from the PHP website. Maybe you've already read it, maybe not, but I hope it'll help.
Performance calibrations - For maximum fuel economy, you should choose a performance calibration, and most people will use a performance tune as their daily driver. Our performance tunes provide aggressive fuel curve and timing curve changes to help maximize efficiency and performance -- not just at full-throttle, but throughout the entire throttle and RPM range.
Fuel economy gains rely greatly on driving style.
Tow calibrations - PHP's tow tunes are written to maximize pulling capability and low to mid RPM torque. Though many customers see fuel economy gains vs. stock or even canned tunes, these calibrations are not written specifically for fuel economy.
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Thomas H.
'97 F-250 CCSB 7.3L Auto, Gauges, Modded H2E, 285/200% sticks, 7.3L IC, Stealth Dual HPOP, Pheonix chip
'03 F-250 CCSB 6.0L Auto, Gryphon CTS, FICM tuning by PHP, Powermax
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