05 performance chip...

weight reduction helps lol. either driver weight reduction or get light wheels. any weight reduction of rotational mass should help with mpg. i think its something like that
 
A chip like that will be way to expensive like BULLDOG or BANKs and don't believe in! Just tune up better plugs and coils and new Air Filter like K&n or Spectre??? and Synthetic Oil in Engine,Tranny, and axles and transfer case and all Synthetic fluids and more, Flush,Flush,Flush ! Name brands and Top Tier gas High Octane and you will save and get performance more !
 
I have friend who has a EDGE in his tacoma and he says you can feel a difference but idk about the other brands. For the most part chips don't do much for gassers. I did get my colorado tuned with EFI Live and it made a noticeable change
 
I've rarely seen a "performance chip" that was actually real. Usually you have to upload a new ECU tune to make any real gains.
 
IMO, the only real programming gains come from a DYNO shop. They establish your baseline, copy the original Toyota map, then make adjustments based on your elevation, tire size, fuel etc..
Normally you get 2 maps in any reader, the original & the modified. For example, I'm always between 6-9K feet elevation, if I went to sea level my truck would run too rich.
 
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