[Power Hungry]

Adam,

Just to let you know, the bulk of the tuning I had originally done on the F150 was at about 4200-4500 feet using 85 octane, so I am quite familiar with what these trucks will do under those conditions.

We've had a few people that have indicated they didn't notice any increase in fuel economy running our programming. Sometimes that's just how it works out. In most cases though we see about 1 to 1.5 MPG. Gains at altitude are usually quite reasonable because of the fact that we can go a little more aggressive on the timing curves, even with lower octane fuels. One thing to keep in mind is that 85 octane at 4000 feet is roughly like 87 octane at sea-level.

Most of our customers don't notice enough difference in performance or mileage (for daily driving situations) between low and high octane programs to justify the expense of the high octane fuels. Of course, the heavy to full throttle power is better on the high octane programs but the reality is that most people don't drive that aggressively and would rather save the money on fuel. Even those who are aggressive have noted that the low octane performance programs are usually more than adequate for their needs.

Hope this helps.