Originally Posted by
blairellis How does advanced timing help with better gas mileage?
It allows for the fuel to burn longer, thus less fuel ends getting burned in the CAT.
The problem is, when you advance your timing, the fuel maps change, so the gains will most likely stay the same. The way to actually gain better MPG's with the timing mod is by getting a tunable ECU, Calum RealTime or Basic, and adjusting the fuel maps, so that they wouldn't change with the timing.
Now I haven't experienced with this first hand, but a knowledgeable friend of mine explained this process to me. If this is by any chance incorrect, please let me know and I'll update it.