Poor gas mileage help

[Grey Crawler]

I agree, but 3.07 gears with 29s is equally bad. Why Bosch instead of NTK?

 

[RCP Phx]

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!

 

[Grey Crawler]

Sorry, I think I read that part wrong about the Bosch and NTK.

 

[Grey Crawler]

Yes, I have a scanner. No codes

 

[RCP Phx]

I wasn't referring to codes I was talking about "live data".

 

[RCP Phx]

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?

 

[Tim_MN]

The testing and repairs have been recommended, the questions have been answered, asking them again won't change anything.



Any relation to bimmerjeeper ?