So i installed test pipes and a pleneum spacer on my car last month,and honestly i regret doing so(except that it really made a performing differance ),i used to see about 23mpg,and now im lucky if i can get 17mpg!So my question is,im thinking about getting a pro-tune,or a reflash.would that help with my mpg?I know that im running a little rich with what i have done..and i know that getting some kind of tune done will really help it run smoth,or it would be enough of a differance that mpg wouldnt really matter.cause if not im about to take that spacer off until the summertime.,cause i drive this car about 50miles a day to and from work on the highway and if im not really making power with it,id rather get the mpgs.thanks

 

humm thats kinda weird man. I installed my test pipes and intake i was getting around 25 even with alot of highway miles. My average is still 25 to 25.3. I dont know bump for you some help though.

 

mines stock excpet exhaust and wheels and i get about 17mpg, i though that was normal

 

Mine boosted is about 15

 

I average about 17mpg. That's around normal according to all the fuel threads.

 

You probably just have a tendency to be heavier on the throttle now...

 

^Kinda like the exhaust theory, no exhaust allows for better mileage for a while after you put it on because you tend to want to hear it more

 

rev-ups often go rich after installing test pipes, I've measured this on cipher.

tuning is your best option

 

so i guess i need to get a utec and call ams..thanks again for the help!

 

Do you mean lean?

 

i installed the test pipes on my 06 and i started getting better mpg.

 

You would think so.... maybe the ECU is overcompensating at that point due to decreased backpressure at the O2 sensors? I dunno...

 

no... I've seen seriously rich AFRs on 97supratt's rev-up after he had just test pipes or test pipes + exhaust

I believe I've seen the same effect on another dyno posted on the forum, but I cannot find either the original cipher graph I made nor the other dyno

 

i only see 17 too... i thought that was normal for in town driving... but if i reset it going down a long highway, it usually pops up to like 25 or 30-ish...

 

for what it's worth I get like 14mpg city and usually 17mpg combined, that's tuned at about 13.1 afr

 

Wow, I have been reading these threads and watching my MPG closely.

On a straight highway trip I am seeing near 26.5 mpg. I just filled up with about 3/4 or more city driving and a few CRAZY WOT runs and averaged 18.2 mpg.

Now keep in mind, I am running an APS TT kit with extreme fuel system, 9:1 CR motor with cams @ 15 psi of boost.

I would be pissed if my near stock N/A Z couldn't pull 20 mpg on combined driving

 

lots of bad traffic in socal... a few hours a week sitting at 0mph equals huge drop in mpg... (I also have bumped idle which consumes more gas at 0mph) I still get 27+mpg on highway trips with no traffic

(I don't feel too bad though, my old Jeep was about 10mpg street, 12mpg combined, 18mpg highway)

 

Mine's is completely stock and I've gotten up to 28.8mpg on the highway.

 

i get 18 driving in stop and go traffic every morning for like 20 miles