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Poor gas mileage help

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!
 
I wasn't referring to codes I was talking about "live data".
 
I have changed o2 sensors, map sensor and switched to 4 hole injectors with no difference. I also have the cat delete. Any advice?

I would also question all of this plus you make no mention of your ignition system?
 
The testing and repairs have been recommended, the questions have been answered, asking them again won't change anything.



Any relation to bimmerjeeper ?
 
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