i downloaded Smarty level 3 a few days ago, i've only ran a few errands thus-far, and i am a happy boy. Since my Westech is on the way from Geno's, i haven't really pushed on the pedal hard yet, but in just normal driving, it is way fun. Tomorrow, i drive from Taos to Denver and back, so i will be able to check fuel. The only confusing thing so far is the difference between each #, one is accomplished with fuel, the other timing, why??? what should i use on my stock truck?