My Hpp3 Vs. Stock Mpg Comparison

[Fortune50]

Been running an HPP3 for a while now and running on 87 octane tune. Bought used off eBay for $120.

Stock: 14.4 best mpg, 11.224 overall avg. on 10 fill ups

HPP3: 15.1 best mpg, 12.274 overall avg. on 3 fill ups

These are real calculations (I don't have a driver info center).

Anyone else have a tune or programmer and have done an mpg comparison?

[ak63]

Since my work involves fuel economy testing I can comment that it is not possible to directly compare mpg across multiple runs even for the same truck, due to changes in other factors. For example, my truck appears to get about 0.5 to 1.0 mpg better fuel economy in the summer than in the winter. This could be due to gasoline forumulation and/or ambient temperature, or other factors.