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Too much fuel consumption

3K views 5 replies 6 participants last post by  aahmed2016 
#1 ·
MY E 46 IS ONLY GETTING 16 MPG
CHANGED EVERYTHING ?

AND I GOT A CODE 149 STORED IN SYSTEM

RPM IDLE IS ROUGH :ben:
 
#5 · (Edited)
thermostat stuck open, VANOS, FUEL FILTER all come to mind

check option 5 on the hidden OBDII menu and see what its telling you you should be getting, then calculate what you are actually getting. that will tell you how far off your tuning is usually

TRICK: dividing the hidden ODBII menu's nummber (ie 96 = 9.6) by 235

235(DIVIDED BY)9.6 = MPG

Driving in Clearwater FL, i just got 25mpg ON US19 (congested highway) using 93 octane ethanol free, doing conservative, but not slow driving skills. thats pretty damn good i would only get 22 on shell vpower w/ 10% ethanol before

Ran through a whole tank of it and then divided out miles and gallons.

my ODBII otion 5 said i got 27, but its always reads about 2MPG higher than what I actually get

USE Premium gas too, that will improve miles by 2MPG avg and make the car run smoother.

The ethanol free, however, made the miles go up ANOTHER 2mpg from shell v power 93 w./ 10% ethanol
 
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