Saving gas [Merged 3-8]

[EHeye]

Alright, our gas prices here locally have sky rocketed like there is no tommorrow. So I have a question, I dont make much money so I wanna save as much gas as possible.

Say im going up a hill about 7% upgrade and im doing about 80km/h (50mph?), in 5th gear to keep it constant im running at 2500rpm and 4-5psi boost, in 4th gear im at 3000rpm and 13inHg in Vaccum. Which one of these will give me better gas mileage, lower rpm in small boost or little bit higher rpm in vaccum.

 

[I-luv-em-all]

Here in my part of Canada premium which is 91, is almost $1.10 a litre

 

[Nt-Eclipse-Dail]

In my daily driver (1990 1.8NT 246,000k and counting) I get at least 500 miles out of a tank before the low fuel light comes on (and when the light does come on, I know I have at least 50 miles left before it is empty). The car has never seen 'premium' gas, I run the cheapest gas I can find... I am guessing that my O2 sensor has about 150k on it.
If I got less than 500 miles out of a tank, I would think my DSM was broke. The best I have ever got was 540 miles (before light came on) out of a tank (all highway miles @65mph) My car has a 16gal tank and right now it takes about $31 to fill it in Mississippi.

Price of gas sucks... DSM's Rock!

 

[DSMeclipse4G63]

yeah those prices in Canada suck, sorry to hear that. Thats like $2.50-2.75 in American which last time I checked blows really bad.... I feel really sorry for you 91 octane guys even though 93 aint too good anways...


oh and to the guy about 140mph pulls please tell me your kidding???

 

[RamenPride]

In my daily driver (1990 1.8NT 246,000k and counting) I get at least 500 miles out of a tank before the low fuel light comes on (and when the light does come on, I know I have at least 50 miles left before it is empty).

the most I ever got on a tank in my 1.8 was about 520 miles during a roadtrip.

i get about 250 miles on half a tank in my GS-T, haven't taken a long roadtrip in it to see what the range is though

 

[EclipseOwner95]

my ### 1g gets like 16mpg in the city, i tryed tuning it, ive replaced everything relative to maintenance , 225 to a tank, 2.50 a gallon for premium

 

[dhonda]

Got to love Cali.
91 - $2.81

 

[97GST6bolt]

It's about 2.35 avg here in dallas for 93. I was getting about 240 to a tank until I started driving like an old man, now I get around 340 to a tank, imagine that!

The second I start to spool, I see my gas gauge needle move down

 

[envybianchi]

yeah here in Redmond, WA it's 2.70 for premium 92.

 

[Fusion1984]

Just thought I would put in my 2 cents. I drove from CT to Miami over my spring break and saw as high as 28 miles per gallon cruising between 80 and 85. However, this was around 1-3 in the morning on a sunday, passing through NC where there weren't very many cars on the high way. Just thought I would let u know.

 

[nuggets]

ok get this, if i stay out of boost i just suck down gas. but if i boost every now in then in a gear or two my gas gauge will go back up....

 

[rob_rousseau]

Had to convert all this to MPG for you guys but the worst i've seen was about 20mpg on the highway cruisin at an average of 140km/h (right b4 the ECU goes open-loop). The best i've seen was about 25mpg on the highway at more respectable speeds. Make sure your A/F guage keeps bouncin' and your not doin too bad. I recorded these numbers on my VERY low-mileage 1G (under 20,000km's) last year on my 4300km road trip. I also have a hard time staying out of the boost, keep in mind

 

[Savage Talon]

http://www.gasbuddy.com/

Highest gas price in San Francisco is at $3.05 gal. Chevron and about 25 miles away from the refinery. The closer you are the higher the gas prices.

 

[BaddAssGst]

You guys are really getting bent over. In Ohio (280/80-90 area) we get 94 octane and I've been getting it for like 2.30 and less. I have yet to pay anything over that.

 

[spoolamatic]

I was getting 25 to 27 mpg on a 500 mile trip @ 70 -75 mph some hills and this is a automatic with mods ,cat in no erg , 255, 880s etc .I set up the eprom mass compensation table so the O2 trims stay as close too %100 for the different Hz that I pull while cruising , witch will keep the trims in good shape . Just do a log of the trims , Hz an O2 volt and O2 trims and see what going on . If the O2 trim goes to far up or down the fuel trims wont change ,same with O2 volts (not cycling)and wast gas and not run at its peak performance while in close loop ,so keep them O2 volts bouncing .

But when the cat is off for tune up reasons my mileage seems to go down a lot.



PS. My boost gauge reads dollars per minute

 

[brandenblaze]

TIP


I've been in petroleum pipeline business for about 31 years, currently working for the Kinder-Morgan Pipeline here in San Jose , CA. We deliver about 4 million gallons in a 24-hour period from the pipe line; one day it's diesel, the next day it's jet fuel and gasoline. We have 34 storage tanks here with a total capacity of 16,800,000 gallons. Here are some tricks to help you get your money's worth.

1. Fill up your car or truck in the morning when the temperature is still cool. Remember that all service stations have their storage tanks buried below ground; and the colder the ground, the denser the gasoline.
When it gets warmer gasoline expands, so if you're filling up in the afternoon or in the evening, what should be a gallon is not exactly a gallon. In the petroleum business, the specific gravity and temperature of the fuel (gasoline, diesel, jet fuel, ethanol and other petroleum
products) are significant. Every truckload that we load is temperature-compensated so that the indicated gallon age is actually the amount pumped. A one-degree rise in temperature is a big deal for businesses, but service stations don't have temperature compensation at their pumps.

2. If a tanker truck is filling the station's tank at the time you want to buy gas, do not fill up; most likely dirt and sludge in the tank is being stirred up when gas is being delivered, and you might be transferring that dirt from the bottom of their tank into your car's tank.

3. Fill up when your gas tank is half-full (or half-empty), because the more gas you have in your tank the less air there is and gasoline evaporates rapidly, especially when it's warm. (Gasoline storage tanks have an internal floating 'roof' membrane to act as a barrier between the gas and the atmosphere, thereby minimizing evaporation.)

4. If you look at the trigger you'll see that it has three delivery
settings: slow, medium and high. When you're filling up do not squeeze the trigger of the nozzle to the high setting. You should be pumping at the slow setting, thereby minimizing vapors created while you are pumping. Hoses at the pump are corrugated; the corrugations act as a return path for vapor recovery from gas that already has been metered.
If you are pumping at the high setting, the agitated gasoline contains more vapors, which is being sucked back into the underground tank so you're getting less gas for your money. Hope this will help ease your 'pain at the pump'.

 

[DSMSpyder99]

Nice, I always fill up at 1/2 tank. In addition, i usually fill up early morning (6am) or late at night (10pm+). I dont fill up when the fill-up truck is there because its a pain in the ass to get around it and it cause "gas station traffic." I'm glad i already do 3 out of the 4 things you recommended.

 

[crimsondragon]

good tips. unfortunately for me for #4, i live in new jersey, where i don't pump my own gas so i don't have the luxury of choosing the setting.

 

[GsxEcutioner]

good tips. unfortunately for me for #4, i live in new jersey, where i don't pump my own gas so i don't have the luxury of choosing the setting.

, when i came to new jersey to see my cousins, i was like wth!? its illegal?

 

[xxraptor660xx]

, when i came to new jersey to see my cousins, i was like wth!? its illegal?

Yeah it's pretty lame.

Thanks for the tips!

 

[Dark_Horse]

I fail to see how any of this is true. #2 for instance. Gasoline is filtered the holding tank to the pump and from the pump into your car and from your car's gas tank into your fuel rail. That means it's being filtered 3x before it even makes it to your injectors.

The rest of the #'s can't be true either because anytime someone complains about not getting a gallon of gasoline, the inspectors (state inspectors?) come out and make sure the pumps are dispensing an exact gallon of gasoline. It's a huge fine for stations to rig their pumps not to dispense a gallon of gas when you pay for a gallon.

I don't buy any of this.

 

[crimsondragon]

you didn't disprove #3 or #4.

 

[jemsoccer]

At higher temps, gas expands. Being gasoline is highly flamable and evaporates quickly, I can see how the temp would affect the amount of gas coming out. The guy is not saying that if measured at say 90* F and at 32* F, that it will not be exactly 1 gallon. He is simply saying that there is more actual gas in that 1 gallon at 32* than there is at 90*. Its more dense at 32*, therefore less room for air. C'mon guys, simple chemistry.

 

[a_scobel]

For number three, the main reason I can see for never letting your tank run near empty is so the gas can cool the pump better, since it acts as a coolant. Also the more gas you have in the fuel system, the higher the pressure. That's why the car seems to have better response when you mash the gas when the tank is full, rather than when it's 1/4 full, even though the full tank provides more weight.

Also there's that thing about condensation in the gas tank..that's why when you put it in storage for any amount of time it's a good idea to have it at least 3/4 full.

As for number four, I don't see what corrugated hoses have to do with anything?? The outside of the hoses are corrogated, not the inside..As for losing those vapors, eh..I'm sure the amount you lose is negligible.

 

[dsmulla]

I don't buy any of this.

You dont need to, you can just save up to buy more gasloine. The procedures that the expert is recommending are not hard to follow so I think its a worth a shot. In my opinion, the stuff is true, I have been working at a gas station for the past 3 years and I do know about the three speed trick at the pump.

 

[Defiant]

Thank you for the cut-and-paste. There might be six cents worth of "savings" in all that.

Pick a sentence and Google it. It's all over the damned web.