Well I know that a stock G35 5AT gets 18/25 miles per galloon and that I used to get 22 miles on my way to work which is mixed driving. Then along came my vortech and on the same trip to work I managed 21.1 or there abouts.....well fast forward to today, I have now installed the fuel return system and upgraded fuel pump along with APS 440 injectors and could not believe my eyes as I logged the milage to and from work........I managed 30.2 miles per galloon
Now who said FI was bad for milage

 

u r NOT bs right??...I'm getting 13~15 city drive

 

18.5 mpg average on my last 19 fillups ... I have a pretty heavy foot for about 19 tanks now Averaged in are also a track day and a drag day on those tanks where I got 8 - 10 mpg.

Interesting that the fuel return system seems to have provided an increase in mpg, that might be worth it right there just to up the mileage

 

I have also heard of another guy with a Twin Turbo 350z pushing 500WHP and getting better gas mileage than stock. He claimed it was due to the FI along with several other mods that would fall in line with what URBAN is talking about. I may just have to pick up a SC to save myself some gas money

 

Nate I would never BS on a subject which is close and dear to out hearts, the difference I see between your Stillen and the Vortech is that when driving around town in manumatic the car changes gears early which means I never get into boost so the milage is awesome, this is anything below 3000rpm, of course as soon as I lay into it it will go down but as a daily driver this is great for me. Now with the Stillen the boost kicks in instantly so even changing lanes will use extra gas....well I think that is why you are getting lower milage than me.

 

BTW Urban, I saw you a week or so ago at APEX motorsports in Santa Clara, turning around in the parking lot. I was over there at an NSX meet, it was pretty well cleared out by the time I saw you. I was sitting in the parking lot next to my G chatting with my girlfriend....couldnt tell if you saw me there or not. Just wanted to say whats up....I recognized you from the Santa Cruz run.

 

What a small world, yep I saw you...actually I was looking at your GF but nevermind I was waiting for my wife as she was my ride back. I was dropping the car off at Scotts that day.

 

I drove from SoCal to Texas (1500 miles) and averaged 27 mpg with my ex-G.

 

Is that avg MPG reading from computing fuel fill-up and miles driven, or just a reading from the nav display? With a new fuel system, I would assume the nav display calculation of fuel consumption to be off.

 

Nope this is from my calculations. I divided the miles I get from the price of the gas and how much I put in, that is how I have it to the one decimal place due to division.

I have never trusted the Navi since it fluctuates to much.

 

Were you able to get AFR readings before and after the install on your SC? If I was running FI, and a SC in particular I'd be really worried if my mpg went up rather than down.

 

I do not have the AF print out before but we could not tune beyond 5500rpm no matter how much fuel we dumped so we did the best we could, we were getting a slight amount of detonation, that is when I decided to get the fuel upgrade and we were able to tune all they way up to 7100rpm so yeah we did a better tune on the car in regards to AF ratio.

I also stand behind the shop which tuned the car as they have done a ton of high performance cars.

 

Jon, plus...if you do that, you could go with a smaller pulley and create more power...safely.