I have an 05 6MT and have averaged 21.8 over the first 5400 miles......this is a mix of highway and city driving.

FWIW, the best fuel saver is an educated right foot.

 

90% city driving(short distances) + lead foot = 11-13mpg (for me)

 

anybody know how much gas is left in the tank when the low fuel light turns on?

 

4 Gallons left and the light should turn on.


I almost always get between 350 and 420 miles per tank.. and have gotten as much as 440 miles per tank. I've yet to have my fuel light come on too, because I don't let it run down that low(bad for car, cus you can suck up all the junk that's in the tank).

Get a Z-Tube and Amsoil or K&N drop-in filter and you'll get an additional 1.8-2.2 MPG across the boad, guaranteed(assuming you maintain the same driving habits).

 

just trying to learn here
why would a Ztube & K&N filter improve efficiency by 10%?

 

i know it sounds crazy but i shift at 3 thousand rpm, i dont really race the car at all, and i get around 210 miles per gallon. Maybe i should get it checked out? Plus I use 93 octane, only the best for my baby However i have noticed that if i do 50% highway and 50% city i can maybe bang out about 270 miles per gallon

 

Yeah im around here, i get 13-15 usually with most if not all city driving

 

19mpg

 

16-17mpg 90% city driving

 

20-21.... 90% hwy

 

Who cares? When the tank is empty, fill it up again. If ya' can't afford the gas, get a Prius.

 

You should get that checked out.....by the Guiness Book of World Records people. 210-270 miles per gallon is more than 10 times what others G's get and at least 3 times the next most fuel efficient car in the world achieves.

 

A K&N will give you an extra 1-2 mpg. The A/C is only going to knock off 1-2 mpg and $ wise its only going to save you much, but just make you uncomfortable. A lot of short trips in traffic are going to kill your gas mileage the most, which is what I remember from my vacations in Hawaii. You really don't have much of any longer open highways to get your gas mileage up as most of us on the mainland do, so I would say your mpg is perfectly normal. If you are still unsure you could try driving across the island in light traffic starting with a full tank and see how much gas you consume after about 40 miles or so.

 

Pretty $hitty so far. I only have 140 miles though. Im getting 12 miles per gallon and Im driving slower than my grandmother. I try to keep on aye on the fuel economy read out from the NAV and maximaize my mileage. I am hoping this will improve to somewhere around 18 MPG down the road...
-Evangelo2

 

If you've ever seen the stock G35 intake tube, it's extremely restrictive and has all these sound baffles in it. It's not really a tube.. it's more like a huge contraption and looks like a paintball gun.



That's a picture I took of my G's stock intake tube, while I was in the process of swapping it out with a Z-Tube. The Z-Tube, on the other hand, is basicly just a pipe with no extra stuff anywhere on it.

The high flow air filter(K&N or Amsoil) will also reduce your intake restriction even more when coupled with a Z-Tube.

I'm not sure what the impact on economy would be if you just got a Z-Tube, and kept your stock paper-element air filter(because I never ran that configuration), but I'd be willing to be that the stock G35 Intake tube would negate any gains that might have been given due to the K&N filter alone. For me, When I put in my K&N filter, I didn't see any real economy gains... but when I added my Z-Tube into the equation, my economy spiked up very noticeably by 1.8-2.2 MPG consistently over a 6+ month test period.
I even took my Z-Tube out for about 2 weeks(to bullet-proof test the economy gains), and the economy went back down for the time that I had my stock tube back in.


One of the many reasons that a restrictive intake affects your fuel economy, is that your engine creates a vacuum(through the intake path) as it works and it also expells pressure through the exhaust. If your intake path is restrictive, there is resistance against the motors natural motions because the engine has to work harder to overcome the resistance of pulling in more air to fill the space that it is displacing as it pushes the used air out through the exhaust system. That additional intake effort both robs your car of some power, and also of some fuel economy(anytime your engine has to work harder while under forward load, you'll get lower economy).

If you want an example, go grab a coffee stirrer or a real small straw and try to breathe through it. You'll notice that you have to suck noticeably harder on the straw to get the air that you need to survive than you would if you just breathed normally. Then try breathing without the straw, and notice how much less effort is involved. Increased effort means increased energy useage. It's the same way with your car and the intake, because a restrictive intake(the stock G35 Intake tube, in our case)makes your car operate like it's breathing through a straw.

If you want to increase your fuel economy a bit more too... try to use your cruise control whenever possible. I noticed that my car gets better fuel economy when I use the cruise control to cruise(even at speeds of like 35 or 40 MPH), than I can get by going the same speed and manually operating the accelerator pedal.