last time i checked better air flow=better mpg

at least thats what everyone in this forum seems to be saying.

 

Depends on the AFR I would say. More air requires more fuel.

 

Thats true. but in general i have heard that a small open filter with a strait pipe is a good 1 or 2 mpg. Plus my car is absolutly silent, freaks me out a bit, i cant hear the engine the windows up. even with the radio off.

 

I was wondering if anybody knows what the best speed/rpm's give the best mileage... I drive long distances more than I like, so to save some money on these CA(+$4/gallon) prices, it would benefit me.

 

65 mph about 2500 rpm and I get 31 mpg

 

Just checked mine, got 28.5 mpg. hwy. It is a 99, 5spd., I have a few things to do to it, I've only had it a few months.

 

i just had to fill up so i checked mine. 28.3 mpg. about two thirds highway.
96 SE 5spd. with 175K miles.

 

I just did a 413.7 mile trip and refilled up with 14.712 gallons of 93 octane Mobile gas and got 28.12 mpg.

I was doing 73-76 mph for about half those miles. I wonder if I could have managed 30 if I wasn't heavy on the throttle a couple of times. The last few miles, I got her up to about 100.

It is definitely more fun to drive a slow car fast than watching people drive fast cars slow.....IMHO.

 

This thread is a little old, but...
Hell, I got 19MPG with bad knock sensor and only city driving

 

20-24 city, 24-27 highway. Not that much difference with the 5 speed manual. (2001)

 

I've yet to duplicate my all highway tank @ 28.4 mpg

But lately I've been getting 26.5 all highway and 29-30 in the city (I like to coast allot, gotta problem?)

99 SE-L 5 Speed w/ mods & around 163k.

 

i pull about 22city and 26/28 highway on 93 octane with auto tranny, and a/c full blast...

 

I just got 26.6 on the highway...perhaps a bit low as it used to do 28-30 easily....but she's getting older....

 

i have a 99 auto gle and i get about 20 mpg hwy

 

I have a 99 with a 5-speed and average around 22-23. That's with mix of driving on the interstate and city everyday. I try to keep the rpm's down but with a 5-speed it's just so much fun to see what it can do every now and then .

 

Around the same thing

 

me to i could have a shelby Z for $400 that just needed some minor rewireing to get it running but eh could not find the title for it. also almost had a 98 cummins 4x4 5 speed from the same guy for $3500 but it was being held for someone else even tho i had cash in hand.

 

im getting 16 right about now but i am having troubles with the evap canister purge control valve solenoid or code p0807 and it is causing my charcoal canister to fill up with gas. normally i would get about 21mpg and i have a heavy foot

 

New record yesterday - 30.96 mpg, 75 mph highway. 96 SE 5 speed.

 

always get 30 to 31 MPG. all stock motor. 167k w/ 5speed. drive it like a grandmother. cant afford prices at the pump.

 

has anyone else noticed that their gas mileage has gotten better over the past 6 months?

 

I get maybe 18/19 mpg. 5 speed with 146,xxx miles. I think I may have a bad knock sensor.

 

Has anyone noticed better gas mileage after putting an aftermarket catback system?

I am installing one tomorrow to my ride because the original exhaust has rotted away right between the cat and resonator. At least it lasted this long. I lost mileage since the break.....down about 2 to 4 mpg lower than normal.

The catback I am installing is a straight thru design too....and yes I am keeping in the muffler silencer.

 

I got a 95, stock, auto, with 250k kilometers on the clock and on my last tank I got 25mpg all city.

I just recently removed the intake resonator and put in a new FPR but I'm positive they won't do squat for my mpg.

 

Im averaging about 26 mpg w/ a mix of highway and city and spirited driving. Its prolly like like 28mpg highway. 22 mpg city. 5spd. and i routinely shift from first at 5k rpm...but i also skip gears too. I love V6 power and the gas mileage isnt all that noticeable. My friend had a V8 and his pockets were always squeezed from gas

 

jus checked consumer guide ratings....22/27 mpg 5psd... 21/28 with 4spd auto and 7.9 secs 0-60

Im doin 0-60 in high 6's w/ da 5spd hehe

 

I just recorded 180 miles on a full tank, all city bwtf. i have read every sticky/search there is about gas milage. About the plugs,fuel filter, air filter and I use 93 oct only. this poor of a gas mileage a definite sign of what the problem might be ??

 

98 GLE w/212K miles.
I do a weekly 440 mile round trip of all highway driving. Fill it up with Shell 93 octane before I leave and have some left over at the end. Checked two weeks ago and was getting 29.37mpg. Just changed the air filter to a good Purolator this morning and will be getting an oil change later this morning, both in anticipation of this week's trip and will be measuring after the trip to see what I get. Hoping for 30+. will post results later this week.

 

24 mpg (mixed driving w/ scale tipped towards city) all stock 162K miles

 

vac leak

 

The items that you mentioned in your note (plugs, filters, quality gas) are all important for improving mpg. I am far from an expert on the topic, but I have done things like checking my tire pressure regularly, getting a wheel alignment and tires re-balanced, cleaning out my trunk of all non-essential items (removed many pounds of junk). Having the spark plugs (platinum) changed at 200K miles proved to be the thing that pushed my mpg up noticeably. I also got some good advice from one of my mechanics regarding gasoline. Here in Pittsburgh, one of the supermarket chains has a program in place that discounts gas at their stations if you buy groceries at their store. Well, needless to say the quality of their gas (even the 93) is suspect and can change from week to week. The mechanic's suggestion was that the store's gas station would 'buy from anyone' and that it would be better to settle on a good quality gas from a major provider. I've gone to Shell and it's proven to be a good thing for my gas mileage. Last thing that I can say is that I changed out my knock sensor about 60 days ago, and saw immediate improvement in performance.

 

1998 Maxima GLE

146,000 miles

I just changed the spark plugs, new air filter, and changed from 87 octane to 93 octane. Everything is stock. I still need to change the knock sensor too. Mostly highway miles.

Went from roughly 25 mpg to 33mpg

 

i have a 95 max 5 speed with full intake and exaust...im runing about 21 if i ***** to the wall it and if i baby the throttle then i get around 26 to 28 most ive gone on a full tank was 423 miles but my gas light didnt come on...scared to find out when it does


edit: i have about 193000 miles on the car

 

1999 Maxima SE Auto with maintenance done to a meticulous level:

 

1995 se 5-speed with 245,000 miles on it. CAI and underdrive pulley for mods that would affect gas mileage. Depends on how clean my air filter is, but i have regularly gotten over 30mpg. I do all highway driving (an hour commute to work and back everyday) and have gotten over 500 miles to a tank almost on a regular basis (just filled up and 526 miles/17.2 gals= 30.58mpg). Its all about driving style, anticipating stops, keeping a constant speed. As soon as you start to ride the throttle the mpg's plummet.

 

omfg... how guys should i just sell my maxima.
i get literally 9 mpg now.. and no im not lying im 100% sure that its accurate -.-

 

1999 Nissan Maxima GXE/Automatic
Cold Air Intake (eBay brand)
~24/29 (City/Highway)

I have a feather foot so that contributes to the "higher" gas mileage.

 

Maxima's fuel tank is 18.5 galons

I like the fancy stories in this thread about mpg....and most of the heroic numbers are based on wrong calculations....like having 18 inch wheels and an inaccurate tio hell odometer or counting the tank as 15 ot 16 galons............I have a very hard time wondering a 12 or 13 years old maxima (even if marvelously maintained) can have a better mpg than a new maxi driving from the dealer in 1996 !

 

 

If you mean better than EPA numbers, those are just Govt figures/estimates. Lots of cars do better than that. Same for Dealer numbers, they can't 'over-estimate' or would get sued.
You ARE right about bad calculations - I see so many "400 miles per 'tank' " I'm sick.
However, there's no reason to expect an older car to get significantly [I]worse[I] mileage than when it was new.