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1. you should be using a gps to track actual miles
2. Scangauge is then set to the gps
3. never use speedo after making changes.
4. do you run a baseline????
mpg at 45, 50 ,55, 60 ,65, 70?
mpg at 2000rpms, 2300 rpms, 2700 rpms......
If you had....then you would already know the answer BEFORE spending $1500
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