Zzp Pcm

[SyntheticShield]

I was getting 32 - 33 easily all highway by hand calculations and could get steady 27 - 28 combined city and highway driving.

 

[Tig]

From what I have seen, the MPG doesn't look bad on the DIC because they play with the Injector Flow Rates. So while your MPG may look the same on your dash, figure it by hand and you will notice the decrease in MPG.

So to the OP, figure a few tanks of gas by hand (the correct way) and compare these to your MPG before the PCM. I am interested.

I don't have a DIC, and i'm a GT

I put the PCM in when i rebuilt my top end doing LIM gasket and UIM doorman replacement, I also added a Stage 1 HVTB and a 3" DP at the same time, and i went from avg of 28-30mpg, to like 19-21mpg if my math was correct.

Also have a 180* T-stat

A trip to Champaign and back from here used almost half a tank (little driving around the city, maybe +10 miles for that, so around 110 miles for quarter to half a tank, so somewhere between 25.8mpg to 12.9mpg (quater tank and half tank respectivly) average of the two, ~19mpg


+ or - 5 miles, took a slightly longer trip back, 5 miles difference from first way

 

[hercman]

That's figuered by hand.

I have found my DIC is within one MPG of reality.

By the way that is with the cruise set at 68.

 

[02BlueGT]

Yeah, I fill up all the way everytime, so I check my mileage by Calculator at every fill up, , to keep an eye out for problems, before and after the PCM it has always been about 1mpg higher on the DIC than I actually get....

On a side note the higher it goes, like when it is in th 24+mpg range it seems to get really accurate, like only off .1 mpg

 

[archemedes]

mines fairly close, about 1 mpg off, and less than a gallon per fill up (actually got better with the zzp pcm)

 

[newfie]

I really didn't get a chance to see what happened when I had my PCM re-programmed...I went from running an un-tuned modded GTP, (and I was not getting everything out of her that I should have) to an Intercooled CT Turbo kit with a shift kit. My difference was night and day, but what I loved the most about the tune was the quick shifts...