So I'm getting ~150 miles to a tank. Tank is 20 gallons.
150/20 = 7.5 mpg
Ouch.
I am running stock PFC basemaps.
Power Mods: Streetport, midpipe, catback, intake, SMIC, PowerFC, ProfecA running 8.5 psi
Peak Injector Duty reads 75%
I have a downpipe ready to go on as well as 1200cc injectors and a walbro pump.
Are the stock maps that rich or do I have a leak or?
Thanx!

 

it could just be the way you drive. my car is still completely stock, and is perfectly healthy to my knowledge, but the way i drive, i have only been getting about 8-10 mpg.

 

10-11 around town for me.

 

18-20 for me.

 

I used to get around 210-230 miles per tank before the new engine. I guess it's the streetport?

 

8-13mph is normal for me

 

keep your foot of the far right pedal and you wont have that problem.
When the boost guage goes up, the gas milage goes down
Unless its a honda- then it gets good gasmilage even if you stick a screwdriver thru the gastank and drive around.

 

Hehe yeah my Geo Storm (Isuzu Impulse) gets 28mpg driving around town in traffic.

 

Hum let me ask you this, when was the last time you replaced your oxygen sensor? This could be your problem but of course if you have a street port then that will definately be your reason.

 

I have never replaced my O2 sensor, although it might have been by the previoous owner.
Yeah I figure the streetport must be the culprit (along with tuning...)

 

Rotaries are not known for their ability to save of gas. It's their ability to create power from a little displacement. Or something like that.

 

not really, efficiency goes up when you are on the boost, at least thats what i find.

 

There must be something wrong unless you're drag racing from stoplight to stoplight. Most PFC owners report an increase in mileage with the base maps (although "base maps" can mean more than one thing). My first guess would be your plugs, I noticed a real jump in mileage after replacing my worn out plugs. In "normal" driving I average 18-19mpg. If I push it a lot I can get down around 12mpg, but 7.5mpg sounds like mileage from a track day.

 

plugs have 3000 miles on them.
when I first got my PFC before my new engine I did get better mpg then with the stock ecu.
After the new engine = worse mpg. With that in mind I guess I have to blame the streetport.
I don't race from light to light, I wait for a nice empty section of road, preferably an uphill twisty section with no sidestreets and go for it :-)