After installing gibson split rear truck runs great rpms dropped to 600,they were running 700 to 750 at idle with just chip and k&n fipk,the sunaco ultra was great also if it wasn't for exhaust wouldn't even know truck was on that's how smooth it was idling and running,unfortunately I went to sunaco to fill up and it went up to 1.69 gal so settled for 93 octane we'll see how that does.But mpg's has definately improved.

------------------
99 F250 XLT LD 4X4 S/C,5.4,3.73 Limited slip,Bright red clearcoat ,remote start w/keyless entry and alarm,chrome rims,tinted,westin nerf bars,factory tonneau,superchip,K&NGen II fipk,pioneer in dash cd,pioneer amp,infinity kappas all around,Lund front runner bug sheild...
coming soon Gibson split rear w/chrome tips,tires,not sure what to do with front grill any ideas?

 

Sorry Mike...I should have mentioned that!! I hate referencing other posts that are not my own...but yours was so good.

I knew that the flip-chip is the only one to be used with regular unleaded and Premium and PREMIUM fuel should only be used with a 'regular' superchip.

Sorry for not being clear! My bad!!

------------------
2000 F-150 XLT, 4x2, 5.4L Supercab, Styleside, Black with silver two-tone, 3.55, class III towing package with heavy duty cooling package, 4 wheel disk ABS, overhead console, sliding rear window, keyless entry, dark graphite interior, in dash CD, Pendaliner bedliner, K&N air filter, rubberized undercoating, cabin filtration system, Bugflector II, 5W-30 Mobil 1, engine build 10/4/99