Gas Mileage

[cincygoat]

Ok so I did a search and I had no luck. According to fuel economy.gov the average user averages around 20mpg out of their 2000 GP GTP and that would be nice if I could get at least that I get better gas mileage in my GTO in the GTP I am averaging 15.5-16.5 it has new autolite 104s a FWI fresh oild change I just used some Lucas fuel system cleanser I need some help here what else could be causeing me to get such horrible gas mileage?

Thanks
Adam

[TheOtherNick]

Too cold of plugs. Driving style.

[a98gtp4u]

with no mods u need al 606's.

[2001GTP]

I only see around 25 on the highway, 16ish in town. I also have a heavy foot though!!!

[Rather B Blown]

if i go by the somewhat inaccurate dic i get 30-33 hwy, and usually 17-18 city...i never actually measured the proper way not too worried about it really

[benner]

I've been running right around 25 highway lately.

Mods are 104's, 3" catless DP, 3.4 MPS, short ram intake, intense pcm, and 180 thermostat.

[TorqueAutoMotiv]

With all mods in my sig i get 16-18 city and 25-30 highway depending on how im driving

id check o2 sensors swap out plugs to 606's
and watch how you drive in the city if your boosting with city driving your mpgs go way down

[Toofastgs]

I get high 14s low 15's city driving like a grandma!

[TorqueAutoMotiv]

ouch

[Bio248]

Too cold of plugs. Driving style.

i would agree with this statement.

[real diehl]

My dic would be lucky to show over 26...highway or not.
I always average around 23 mpg though, calculating it the right way.