I ran a 15.08 on the GTech AT the track and the track time slip said a 14.98. I also went a 15.22 on the Gtech AT the track and the track time slip said a 15.12. The Gtech was consistantly 1 tenth slower than actual ET, but the MPH was off a variable 2-3 mph or so (fast). I think traction also had something to do with it. I just put in the Yank TT3000 around Xmas, and haven't been to the track yet, but I have pulled fairly consitant 14.6 and 14.7 Gtech times, with a 14.63 being the best to date. I hope it is still a tenth slow and I can rip off a 14.5 at the track when it re-opens. I'd say (guessing of course) that your truck with the mods you stated that should run low 15's (15.3 or maybe better) at the track if you lose the passenger. And also if you run the fuel down and then add some 100 octane or that 104 you have and keep your fingers crossed for a 14. I don't think it would take a miracle to run a 14. Just some good weather, let the truck cool down real good, and that gas will make a difference. I run 94 octane Sunoco and with the HPPIII I still get some pinging (which causes loss of timing and HP) on hot days or under heavy load. Good luck, I'll keep my fingers crossed for ya'!

 

I Ran at the track while running my G-tech and it read that i ran a 15.18 @ 93.9mph, while my timeslip read I ran a 15.383 @ 87.98mph. My truck is a 4x4 RCSB so I assume your Yukon weighs about the same BUT I have headers and that nocked .3 off my timeslips and you dont, so i think you'll run higher than me. So all I have to say is good luck, But i assume you run 15.6's or higher.

 

MPH 93-96 wow
I don't run but 90 at 15 flat,your probably well into the 14's Jim

 

Cool, I have a few gallons of 104 here at the house I could throw in, anyone know how hard it is to remove the 2nd row captain's chairs?