It's time to push the car to it's limits.

[Compaq888]

I've been averaging 28mpg. But now I'm pulling out all the stops. I have done some research and at least 8 garage members have their tires inflated more than the max cold pressure. I will now inflate my tires to 55psi.

-I have turned off all my electronics. Only thing will be used is cruise control.

-Car will NOT coast in neutral or with engine off. I already blew my rack&pinion, I don't need any problems.

-Converted all my Brake lights to LED's since it effects fuel consumption. My license plate bulbs are now LED.

-I have added Rear Belly pan, and 2 Front undertrays.

-Using synthetic

-Using NGK V power spark plugs

-Using AutoRX engine cleaner.

Anymore tips to break past 30mpg mixed???
I don't plan to use any other oil viscosity and I already did a tranny flush, alignment too.

I also want to join the hypermiler bandwagon.

[GasSavers_brick]

Breaking 30mpg will be all about how you drive the car since you're pretty maxed-out on mods. Do you know about all of the techniques that krousdb uses to break 60s in his Del Sol? Use them all, with the exception of engine-off coasting since you don't want to. That means driving with the load (let the car speed up as you head down hill and then trade that kinetic energy for potential as you come up the next, reducing speed on the way up.) If you are on the freeway, try to keep your speed around 60 or less if possible. Anticipate lights and traffic so that you don't have to use your brakes. Accelerate as gently as possible and keep the revs very low. Drafting is a touchy thing, so that's up to you. Personally I don't touch anything but a long straight draft or the occasional side draft if I get lucky. Don't want to bang up my car! Finally, remember that short trips on a cold engine are the real MPG killer. String those trips together if at all possible.

Finally, do you have a ScanGauge? That feedback is worth a mint! Having instant fuel economy right in front of you will help modify driving habits for the best results.

I've seen low to mid 30s on the highway with my girlfriends AWD Volvo using nothing but feedback from the trip computer, gentle acceleration, DWL, and low speeds. Your Altima ought to be cake compared to that heavy beast. Be religious about your driving and you will be over 30mpg in no time. Probably much higher.

[Compaq888]

I don't need a scangauge. My car follows one rule. The lower the rpm the better the fuel economy.

My altima is heavy. I have an Iron block which weighs more than most v6/inline 6 engines.

btw I have 4 cylender.

the only thing that's different from my 32-33mpg freeway runs is more pressure in the tires, Auto-rx, LED's, and less electronic stuff used.

[zpiloto]

I think 10-15 over max rated is a good target to look at. My max is 35 and I am currently running 50/45. I thinking of going back to 45/45 because the ride is harsh on rough roads. I did not notice any change in FE when I went to 50. AC a killer and if you travel the same routes and know the light patterns you can turn off the engine at the long ones and transmission in neutral on the rest if you're not already doing it. I lose almost 1 MPG a minute on the trip MPG when sitting at a light. Try to stay away from the track for a tank

[Compaq888]

I couldn't get the tires up to 50psi. After 46-47psi the gauge gets very inaccurate. My max cold tire pressure is 44psi. I put all the tires at 46psi. I can't get another gauge right now because I spent the money I don't even have on a rack&pinion and even that was half assed. One part is missing.

[GasSavers_brick]

Originally Posted by Compaq888

I don't need a scangauge. My car follows one rule. The lower the rpm the better the fuel economy.

In general that's how it works. But you would be amazed at what subtle changes throttle position do to instantaneous fuel economy. The reason feedback is important is because it is possible to be driving along at what you think is steady state, but you are actually accelerating imperceptibly. Backing off of the throttle to achieve true steady-state (or even imperceptible deceleration) can make a difference to the tune of several MPG. You don't need a ScanGauge, I'm just saying it would really help you to fine-tune what the right foot is doing.

[Compaq888]

If I had the money I would buy it. I just spent $500 to buy a replacement pinion&rack and have it installed.

I could totally see a 1mpg improvement with the scangauge but i basically covered all my bases. When I accelarate slow and drive 65mph I get the best mpg. If I go 55mph I get half a mile more per gallon.

[molecule]

i recommend a good catchcan setup...
since reburn was introduced engines send all the oily gunk from crankcase heating back directly into the intake to be burned in the engine...
some cars produce significantly more gunk and hampers performance
it doesn't belong in the engine...it doesn't belong on the roads either...
all cars used to just dump emissions to the street
maybe you are too young to remember all the black lines down the center of every lane in america...

[Sludgy]

What if you hit a pothole, blow out a tire and kill someone? Who is liable?

Nissan? Michelin (or whoever? Gassavers? Matt Timion?

All I know is that it's not ME. I hereby advise against overinflation.

[Compaq888]

I have a catch can setup just need to install it. Since nissan put the PVC in a almost inaccessable space I'll just install the PVC catch can when I'm replacing the PVC.