What MPG are you getting after going F.I.
 

Out of curiosity, I was wondering what everyones MPG is like after going F.I.
Given that your not at WOT all the time, post what Your average MPG numbers, and what type of F.I kit you have :driving:

EDIT: I know when going F.I. MPG isn't a priority (obviously lol) Just thought it would be interesting to see everyones numbers. :tiphat:

I average around 21-23 highway usually. It isn't too bad when you stay out of boost...but where's the fun in that? :driving:

If you drive with a light foot, you could actually see an increase. I remember seeing a guy on here who was getting 30+ on the HWY at 70-75. Its all gonna depend on how you drive, obviously with the larger injectors and fuel pump, if you are heavy on the throttle you will see a decrease. However like I said above if your driving patterns do not change, you will get an improvement because it takes less input of the throttle to achieve the same thing.. Hope this helps.

Holy cow 30+!? Thats pretty amazing! Lol :D

That is what he was claiming, I have not had enough real world testing on my car, however I can confirm on this in the upcoming weeks.

The 30+ was not real, he was using the digital screen on the left which is unable to change when you alter the injector size/flow.

Makes sense, thanks for filling myself and everyone in. I wonder how much the DIC is off after the changes to fuel pump and injector. I still don't think you would see a decrease if you drive with a light foot. Interested to see what the other FI guys have to say, I am sure some will chime in.

If you stay out of boost you can match or maybe get slightly better, if you track via fill ups & miles.
My daily driving of my SC car I Get 18MPG but that is some highway & some traffic plus the usual fun areas. Freeway I can get into the low 20s which is nice with how big Houston is.

I have a customer who took a trip from Charlotte to Dallas and averaged around 34.5mpg verified by actual fuel consumption, not the MPG gauge on the car. The MPG gauge on the car said 40+ :bowrofl:. This was the 2012 Nismo we did with the GReddy TT kit and DW 850cc injectors. He had a real light foot he said. His intention was to get as good of gas milage as possible. On the way back it some how dropped to 23mpg LOL (I think he must have started to have a little fun on the ride back).

Thanks,
Alex Goodwin
AlexG@motionlabtuning.com

Hopefully this thread doesn't turn into another "30-40" mpg.
No one is getting that kind of mileage on a TT Z.

Best mileage I got was around 20-21 mpg all highway drivin from Miami to Orlando. Light boost, tried to keep out of boost but there were times I got into it.

I hate it when sponsors make untrue comments to sell stuff. There is no way in hell that MPG is going up after FI. You are adding additional weight to the front of the car and dumping more fuel. At best, you will come close to your original MPG. That is if you ONLY drive conservatively and NEVER hit boost.

If any shop or tuner believe any stories from their customer that their MPG jumped up after FI, then I question the integrity and the technical knowledge of the shop.

I still think it is possible to get slightly better fuel consumption with a light foot and FI. My reason being that this system is going to be fine tuned for the injectors and fuel pump in the car. With that being said who really cares when you have FI lol

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Turbo's help the motor exhale and breath. All else being equal, cruising MPG should go up. BUT, part throttle and WOT get so much worse that it more than makes up for the extra you get while cruising.

That is not true. Turbos are mounted on the exhaust. They create back pressure and restrict exhalation.

And turbos doesnt necessarily help the car inhale better either. At cruising speeds, the turbos are not spun fast enough to create boost. The engine is running in vacuum.

The only way that turbos increase MPG is by decreasing the engine size. Car manufactures use turbos in the cars to create the same amount of horsepower with a smaller displacement engine.

For example, BMW 335 uses twin turbos to enable a 3.0 liter engine to output around 300bhp. Without turbos, the same engine would probably require a 3.5 liter to make the same power. At idle and cruising, a 3.0 liter engine will use less gas compared to the 3.5, therefore you "increase MPG by turbos".

However, slapping on turbos on the same engine with same displacement will NOT increase MPG.