Added benefit from HFC's...
 

3 MPG more than what I had prior to installation, first time I actually took the time to test it, Temp was 39, cruising from Las Cruces, NM to El Paso, TX. And with an SES light to boot! 32mpg... 370Z: EconoSport.:tup:

http://i250.photobucket.com/albums/g...t6/p_01182.jpg

Math?
 

was that 32 by doing the math or just by the on board computer..........?
:twocents:

My on board computer reads 19.9 at best! My best hand calculation was 20.3 also, how are you guys getting that kind of mileage?

21.4 overall with the 7AT and Im kinda of a heavy foot driver but when not trying to beat everyone the AT keeps rpms down and gets good MPG.

On board computer, I wanted to do a comparo with its reading before and after HFC's, the before average at the same speed and distance traveled was 29.1, using the onboard computer with practically the same variables equated to a gain of 3 mpg, not bad.

Yeah I do have a lead foot myself, was happy with the 20 I got though...

Found out later on it was measured in L/100kms.. FML lol

I find the computer to be accurate. Very very close to manual computation.

This thread is timely...been thinking about getting the HFC for Xmas.



30+ mpg? Are you driving at 60mph?

On the highway between El Paso and Las Cruces, the speed limit is 75, after a recent ticket scare, I stayed at 75 the whole way, I didnt take the picture until after I was parked at my apartment. The MPG stayed pinned at 31.8 the whole way, I was amazed. Get the HFC's, you wont regret it.

i normally get over 25 in heavy traffic. Not sure how some of you guys are getting numbers in the teens :icon14:

The ones shifting at 4.5k :rofl2:

If you are doing that quite often, then I can see your fuel economy suffering. If you are on the high way for a good time without having to slow down and accelerate alot, then you should be ok with some occasional "spirited" RPM shifting :driving:

I get 14mpg to and from work these days because it's 25F outside and my engine never fully warms up.

HFC's...
 

BTW, what is HFC's...? Sorry I don't have a clue. I tried a search without any luck.

Thanks
:(

High Flow Catalytic Converters.

22

I get 24-25

If you can't get past the teens...maybe you should let your car warm up for 10-15 minutes before driving. Its better for the car that way anyway

:ugh:

Actually, it's worse for the car to sit for 20 minutes ice-cold and idling than it is to be driven conservatively. Conservative driving when cold will warm the engine faster and lead to less wear overall. Been at this winter driving for some time now :tiphat:

Bone stock I saw a hair over 30 MPG on a trip to southern VA. Pretty pleased at the highway economy of this car.

Do all HFC put a SES light???

They are not supposed to...

Berk is one of the brands that most people have reported no issues..so...:ugh2:

Fast Intentions have a design which should prevent it as well, so far, I've not heard of anyone tripping the light.

I have a SES, but i'm attributing it to an air leak before the O2 sensor because I didnt use the proper gaskets, I plan on getting the issue fixed when my exhaust comes in.

I don't recall saying 20 minutes. :p I said 10-15... And if letting your car warm up for a few minutes before driving it is so bad for the car..why are you not supposed to drive it after first turning it on in the cold weather?!! Belts squeak when the car is cold....

Technology now makes it so you dont have to wait for the car to warm up like you used to. Now it warms up faster if you drive it.

computer on mine reads 19 mpg for me. but i also do drive in traffic.

Exactly. The idea of driving right away is that the engine warms up more quickly if you're driving between 1-3k RPM than if you let it sit at 750rpm.

I have Crawford HFC's on my G35C, I have had no issues. And people I know that run the them have had no problems aswell.

i dont have any mods yet... best i did from Franklin Tennesse to Newnan Georgia was 23 mpg. But again i was cruizing around 80-85. I know with my current tank its even going to be worst because its all been city driving.

How are you guys getting 30+ mpg?

Not quite sure how having your car sitting while running for 15 minutes is going to improve your gas mileage.

Frost how the hell do you get 25mpg in traffic :icon14:

OP how the hell do you get 30mpg period, lemme guess cruise control, all highway, flat land the whole way.

Constant speed, flat highway, yep cruise control, cool temps, light traffic, pretty much all fell into place on that fateful day. When I drove to Ohio from Texas a few months back, my average for the entire trip was 22mpg, to include city driving, I dont drive like a grandma either, but I try to stay in a high gear when possible.

Will it really get 28+ mpg if it gets turned on and goes immediately in 20 degree weather?

I dont see why not!

This engine warms up pretty fast. Aluminum is a wonderful thing. I'd say it only takes a mile or two to be burning fuel efficiently, unless it's colder than a rat's a$$ outside. Easy for me to say though, I have a garage. :icon14:

I drove from St. Louis Illinois to Elizabethtown Kentucy using only a half tank of gas. I am not sure how I managed that but it shocked the **** out of me.