| Minimal boosting, if at all, no WOT. Today my fuel light came on at 180 miles.
The OEM gauge read 3/4 full @ 75 miles....I realize the OEM gauge may not be linear and I have confirmed several times over the years that my fuel light illuminates with roughly 5 gallons left.
This indicates roughly 12 mpg. About 4 years ago on a JWT EPROM and stock injectors with single intake, I was seeing well over 20 mpg, sometimes as high as 22-24 mpg. So how can this happen? There can only be two possibilities right? Software vs hardware I plan to have the tune looked at soon, but I have good reason to believe that while it may be on the conservative side, it is not responsible for THIS level of fuel consumption. Hardware variables I have checked:
compression-----4 cylinders @150 or 155(one @160, and one @140)
fuel filter-----relativley new (less than 15k) OEM
air filters-----new
vacuum/boost leaks-----checked and none
injectors-----new Nismo 740's
gas cap-----on tight
fuel lines----I cannot smell fuel at all with car idling in garage after a drive, and all lines in the engine bay check out good
base timing-----set to 15 degrees, ecu timing also at 15 degrees at warm idle
MAF sensor-----voltage checks good in DataScan What else could I be missing?
Fuel leak somewhere between fuel filler cap and engine bay?
O2 sensors? Mine may be original. I don't recall ever replacing. Should this matter once the car is at operating temp? Or do I have it backwards? Anyone else had a similar experience and manage to resolve it?
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