After some dirty looks from grandma and grandpa on the way home I finally did it. Gas is at 3.03 for premium in ALA, when is this BS gonna stop? Here's proof:

Im sorry if yall dont share my enthusiasm, but man this is so F'n righteous. I wonder if there's a way I can get my ECU changed so that I cant rev past 2500RPMs, or If the car can run with 3 spark plugs only(like an I3).

 

I wish it was 3.03 for premium here

 

You actually believe that machine?

Check your fuel economy the real way. Reset your tripometer when you fill up and divide the mileage of a full tank by the amount it takes to fill up.

 

its semi-correct, last week i averaged 17.9 MPG on the computer and traveled 349 Miles and when I filled up today I put in 19.3 gallons so I figure its close enough.

 

WTF 19.3 gallons?

 

I got 92 MPG

 

yeah i kinda ran it all the way to E(correction past E)...I live dangerously.

 

Over the weekend I did some highway driving and actually got the computer to read out just over 30 MPG (I think I peaked at 30.7). This was all highway driving with no stops, and cruising around 75 (normally the computer doesn't report this good of mileage when travelling this fast...).

Anyway, as soon as I got into town the MPG got killed.

Oh yeah, regular here is now $2.95, and so 93 is either $3.15 or $3.19... and summer just got here.

 

I have gotten 33.4 mpg Hwy only. I left Greenville, SC yesterday and drove to Bloomingdale, GA. My fuel economy is phenominal. I did get pictures from my camera, just can't upload. Batteries dead.

 

Anyone else 'get' it?

 

premium is about $3.15 - 3.20 here... so far on my current tank, my display says 27.x .. only used about 1/3 of the tank.. and that includes driving around town a lot.. in fact, I get better gas mileage driving around on intermediate roads than highway quite often.

until today, I was well over 28 mpg according to my computer.. we'll see what it really is when I fill it up

 

I hit over 30 mpg. Right after I reset it. Whats it say now?

 

Anyone bother read this? The trip computer is off by a small margin, and it is off in the 'good' direction. So the data you're reporting back is false. Only way to check it is the way that is described in the quoted post.

 

3.03 for prem?? MY GOD! i pay 3.70+ ...!!!! I hate california! by the way i drive like a crazy person.. i seem to avg no more than 21 ...thats with highway and street mixed in.. just on the street prob 19 or so.. just highway around 24 25

 

thats the way I do it, sadly i usually don't get above 20mpg and I am lucky if I can get 320 miles to the tank(traffic and city driving). I don't push it either(prices are too high) btw this is in my 5th gen, it actually gets worse gas mileage than my 2nd gen (averaged 20-26mpg about 70% of the time in the ole girl). Worst gas mileage I got on the 2nd gen is 18mpg(WOT and just pushing it to near redline) and 13mpg in 5th gen(nowhere near the same amount of lead foot to get this mileage). This blows

 

sdoejot - I hope you didn't REALLY run your tank so low you put in 19.3 gallons.

Are you aware your fuel pump is inside the fuel tank, and depends on having a few gallons of gas in there to keep from overheating? Ask your dealer what he charges for a new fuel pump. Installed. And if the failure was from overheating, it is customer abuse, and not covered by warranty.

Are you aware of the very expensive problems that can result if you actually run out of gas in this car? I mean in addition to a new catalytic converter? Again, if caused by running out of fuel, forgret warranty coverage.

There are very good reasons Nissan sets the fuel gauge and fuel alarms in this car to show empty with four or five gallons left. To enable you to 'live dangerously' is not one of them.

If you have a crush on your Nissan dealer's service advisor, and would like to spend a lot of time with her, then you are playing your cards very well. If that is not the case, I hope you just won the big lottery, because you are headed for some expensive lessons.

You remind me of me when I was your age. I finally learned from my mistakes. I hope you learn faster than I did.

 

Ok, I'll bite. My on board computer read 33.4 mpg coming here (piece of inaccurate, over priced good for nothing, display screen). Let's take your theory, that it is off by a small margin. No problem. Would you consider 2mpg a small enough margin? Very well, I averaged (highway only) 31.4 MPG. That is by no means a small feat. And to top it off, I wouldn't consider 2mpg loss, a small margin. I was grotequesly exaggerative IMHO. I have also noticed that when I double check the accuracy of the onboard screen, my 'actual mileage' isn't much less than the screen reads. I doubt the difference is significant. But for honesty's sake, I have bounced it off the dash numbers with real numbers.

Congrats to the OP! That is a kickin' feeling.

Swee

 

yeah i've gotten mine up to 98.4 mpg before!! i would go by the old and original way to get my actual mpg,but gas here is $2.90-$3.10 i would hate to live in cali. but gas is just to damn expensive!!

 

That computer works off of O2 sensor voltage, speed and MAFS voltage. It's easy to fool.

 

So not getting into the debate if the computer is right or not, I know that I'm getting reported MPG which is way less now than it used to be.

What kinds of tune ups can you do to increase your mileage??

The dealer informed me that the fuel filter is self cleaning, so it doesn't get replaced. The only other thing I can think of is spark plugs.

Any other tips would be appreciated.

 

I thought those tanks held 18.6 or 18.9 gallons? Sure you aren't getting ripped off at the pump? How do you fit ten gallons of **** in a five gallon hat?

 

He put in 19 gallons, that is not the same thing as 17.9 miles per gallon. So this comparison is invalid. That was LA02MAX's point.

FYI, A34's have a 20g tank.

 

Are there any other mods outside of the CAI that can improve gas mileage? I was hoping the phenolic spacer would, but Deus and Ritz saying no change...

 

I got 99.9 MPG for 10 miles. . . . . . . . course I was coasting down Mt. Baldy . .hehe.

 

When I am driving 100% highway at constant speeds I can get 30-31 mpg, however city mileage totally s&*ks: 17-18mph at best.

 

If the filter is self-cleaning, where does the "dirt" go? -- the gasoline is all going to the engine, so I hope the dirt is not going with the flow. Don't believe this crap from the dealer.

There is good advice (as usual) in "light's" post, above. The tanks in the 6th gen Max are rated at 20 gallons. So 19.3 gallons is not a problem -- except for not providing sufficient cooling to the fuel pump submurged in the gas tank.

As for calculating MPG, the most accurate calculation is to divide the mileage driven since fill-up by the volume of gasoline bought at the next fill-up (as discussed in post #3). But there is one problem with this process -- getting the gas tank filled up to the exact same level each time you do this calculation. The auto-shut-off on each gas station pump cuts off at a different level in your tank (based on the settings in the nozzel on that gas pump line), so this is not as accurate a basis to use as it should be, unless you go the the exact same pump each time you fill up. Still, these calculations are reasonably accurate, if you attempt to fill the tank to the same level each time you fill-up.

I also acknowledge that each Max is slightly different, so what happens with your Max's computer calculation may not be the same as the next Max owner's experience. That being said, I've noted that over a number of fill-ups that the average of the computer MPGs and the manually calculated MPGs are very close to the same (within a few tenths of a mile per gallon). I continue to track MPG using both methods -- to be certain that the Max's computer is working correctly.

Regarding the post that says: "That computer works off of O2 sensor voltage, speed and MAFS voltage. It's easy to fool." This computer's calculation of MPG only uses the miles driven since this calculation was reset and the volume of gasoline consumed since reset (not certain where this volume gets measured, but to do this calculation, it has to be measured somewhere). The other items mentioned in this quote are not used for this calculation.

I would expect that you should get the best MPG when you are driving in top gear going between 45 and 55 mph at a constant speed (no stops). Driving faster than about 60 mph will begin to cut into mileage, and driving below about 40 mph will result in a lower gear being used. Stops really cut into mileage, so try to time your driving to minimize stops.

Finally: This post belongs in the Fluids and Lubes section of this site. Don't be surprised if it gets moved there.

 

I can easily make a trip back n forth from Silver Spring, MD to Queens, NY... that's easily almost 500miles total. Avg around 30mpg.

 

lol, or 920???

 

The premius here (Brooklyn, NY) is $3.29 or is it....

The computer is bulls. I can get it to show much more then yours show. Your proof is inadmissable in court...er, the org.

 

Well all I gotta say is that I think the screen is accurate enough. After 1 week and 350 miles, it was only off by 1 tenth of a MPG. That 27.9 I got was over the 8 or 9 mile drive home from work.

And as far as the fuel keeping the pump from overheating, I knew about that a long time ago...pretty much every gasoline fueled car is built like that nowadays.

 

I used to fill up when on E and way passed it, filling 18.5 to over 20 gallons at every fill up and no problems were reported. I go earlier (filling 17-18 gallons) because I actually run out of gas at some point couple of month ago. Call my bro and another maxie came to the rescue with 2 gallons of premium. Thank god I wasn't on the highway as that could have been a pricey mistake. The whole system was close to 21 gallons or possibly little over, don't recall exactly now

 

Do us a favor and, like a user posted, see if you can do your own mathematical MPG estimate based upon miles driven vs. gas used. Just do it to compare it to the computer's calculations - I'd be curious.

At any rate, that is a damn good MPG.

(Gas is starting to creep up there again, huh? Right now it's $3.50/gallon here on Long Island)

 

With my lead footed driving i cant seem to avg anything over about 22MPG. in all my maximas the same result. its just FUN to accelerate fast...lol

 

My wife just did a 1/2 tank city and 1/2 tank interstate....got 26.4 MPG. I think she may have been haulin *** on the interstate though. She usually gets 22/23 average in day to day driving. I've got the Fujita on it right now, but would be interested in any mods to give me (her) more HP and better MPG.

 

OP,
any mods on your car?