nope I stick to whatever is posted on my gas door which is premium 91 or 93 I never go lower

 

how much noise did the tanabe exhaust add?

 

IMHO, if mpg is that important, I'd stick to oem mods. ie.. HR powered 350z Y pipe and the revup airbox mod.

 

Drive it like an old lady ..

 

And your engine takes in more air as you open the throttle... if it doesn't, something is wrong with your car. If you have an intake, if you can hear it, you're wasting gas.

And the key here is properly sized. Not just any upgraded exhaust. You can get a huge exhaust, but it'll only help if your motor is able to pull in enough air.

Without a tune, this would be the best way to go. With enough aftermarket mods the ECU will tend to lean out a bit (which is bad for power, and coincidentally, bad for mileage). But that's nothing a good tune can't fix. But if you are getting tuned, aftermarket mods are the way to go. So far, the more I open the motor up with breather mods (i/h/e, etc...), as long as I retune, I'll get better mileage.

 

keep the car tuned-up & tires well maintained, use quality oils & fuel, lose excess weight, drive responsibly and conservatively, use cruise control - pretty boring hey? that's the point though. there aren't many "mods" for the G that are aimed at increasing mpg.

typically when people start on the mod bug their fuel economy will suffer since they are enthusiasts to begin with, hence the need for mods. what good is a fancy exhaust or intake if you don't dip into the throttle enough to appreciate the mod?

 

youl never get more mpg with any mod unless you lay off the throttle .. or tune it ..

now go drive your car like it was meant to be driven .. lol

 

With the context of the gearing discussion, opening the throttle 50% with 4.11 gears vs 2.0 gears would probably waste more gas. As you are making the motor turn more revolutions per amount of tire rotations.



Actually leaner is better for mpg. But not necessarily for performance. There's a reason why car makers work on ultra lean burn engines. If the engine can operate w/o triggering the knock sensor thresholds, he will probably get better mileage. But then again, since we are talking part throttle, the ecu would be trying to get the engine's a/f ratio to whatever pre-programmed target anyway. A relfash would only work of they alter the a/f targets to something leaner. But IMHO, it's something a but richer as most reflashes are performance oriented. But I could be wrong.

 

The ONLY mods that works: A lighter foot.

The only other mod I can think of is a custom tune for an economy map. I have 5 maps in my reflashed ECU, and one of them happens to be an economy map which seems to work well. (I've only used it for about 300 miles out of the 6000 tuned miles so far )

 

Has UpRev described how that flash is tuned for mpg? leaner a/f?

 

This would actually depend on the car. The closer you can get the torque and horsepower, the better efficiency you are running. Lean should be better, but in real life, it doesn't work that way. To save gas, while running more lean while at cruising speeds should be better, unless you are driving hundreds of miles at one constant, never changing speed, you need the power to get up to speed quicker, and you want the motor to be as efficient as possible. In California, you don't want to have to mash on the gas pedal to get up to speed for every hill, or every time the idiot in front of you brake checks for no reason. And technically, it's not about horsepower... it's about the torque, or at least getting the two as close to each other as possible for more usable power.

 

Be easy on the go pedal. A few hard runs and she will drink like a pig. Take it easy and you can see 400 plus out of a tank of gas. Also depends on your commute in the Charlotte area!

 

I thought a/f ratios were real life? Gearing doesn't make the engine less/more efficent.

Like I said, if you mash the gas, it has the potential for using more fuel as you want the engine to take in more air. But the engine will only take in as much air as it will take. If one installs a ultra low gearset and if you mash the gas at 1500 rpm, you won't use "more" gas. The car will only accelerate at a certain rate (dependant on engine efficency yes).

Put in a set of 4.56 gears and track your mileage. You'll be able to get to speed much quicker. But I bet your mileage won't improve.

 

sell your g and buy a vespa scooter .. lol

 

While a/f and gearing is an issue, if your car doesn't respond well when you step on the pedal, you're wasting gas.

There's plenty more to saving gas than just weight, how your engine is running and gearing. But get more than 30mpg at least on the freeways on a 400 mile trip first, then argue with me. Better yet, do that in a car that handles and accelerates hard, then come see me .