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Ok, getting back on track. Let's just say that the speedo and odometer are both reading accurately. They were checked with my gps. What other issues might cause poor mileage? Specifically, a 35% drop.
Gear ratio would effect the PCM / TCU inputs so the correct speedo gear
Over-all trans health (trans cooler, shift kit, correct ATF, etc)
Properly adjusted TV cable to insure good pressures
Good tires with correctly inflated air pressures
A cat or O2 sensors going bad
Any of the engine sensors failing, I don't see where you did any scanner testing
I'm at 5.5" on 32's with a 325+ HP stroker engine and get 18mpg on the highway!