- Jan 2, 2006
- 10,455
- 35
- 91
Right. If it's coasting in 5th gear at 10mph at 500rpm, then Nebor is right. But as long as the RPM is above idle you'll see benefits.
Right. If it's coasting in 5th gear at 10mph at 500rpm, then Nebor is right. But as long as the RPM is above idle you'll see benefits.
I read an article that said the EPA or somesuch entity is the one who tested and rated mPG on cars, not the auto makers
zephyrprime
Diamond Member
- Feb 18, 2001
- 7,512
- 2
- 81
With that big of a deviation, there's probably something a lot more significant wrong with it than underinflated tires or a dirty air filter.
You may be getting blow by or your o2 sersor is busted or your mass airflow sensor may be screwed. The fact that you get the same mileage in highway and city driving is especially suspicious.
You may be getting blow by or your o2 sersor is busted or your mass airflow sensor may be screwed. The fact that you get the same mileage in highway and city driving is especially suspicious.
I think my car eats to much gas. But maybe not. I have a 2002 Nissan Sentra with 94,000 miles. I been watching how much miles i get with a fuel tank. I have gotten about 310-320 miles before I had to refill it. Its suppose to hold 13.20 gallons. So i'm getting about 25 miles per gallon.
Do you think 25 is good? I travel 63 miles a day.
Do you think 25 is good? I travel 63 miles a day.
CrackRabbit
Lifer
- Mar 30, 2001
- 16,642
- 62
- 91
The EPA is the one doing the testing, but the tests that are being used were created in the 70s, they measure the fuel usage at 55mph with no a/c turned on on a simulated flat road. It is very easy to get great gas milage in those conditions, thats why the numbers for almost all makers and models tend to be inflated.
Do NOT put the windows down. It kills your aerodynamics and the airflow etc etc. It was proven on The Mythbusters. Windows up = better MPG.
- Jan 2, 2006
- 10,455
- 35
- 91
Wasn't it for only a certain speed and above though? Like windows up for highway. For cruising around town it really doesn't matter?
Don't go by the size of your tank, go by how much you put in the tank. Its a little closer, but still just an estimate at best.
@fuzzybabybunny: I agree 100% about the coasting in gear. It's true what you've said. They even formally announced it in the news on Top Gear a while ago! 
But yeh, it's true. If you have an instantaneous mpg reading (or even one that does an average, just reset it and it's as good as instantaneous for a while)
Coast along in neutral (let's say downhill, to help keep you going) and it'll eventually max out somewhere (it may be off the scale, if so, use the range left reading, as that'll go up into thousands)
Now, put it into a high gear (so that engine friction isn't going to sloow you down to quickly) you'll notice that the mpg suddenly increases again (or range goes up again, depending on what you're looking at).
It works, I've done it in my car.
If you want more mpg, you don't necessarily have to drive slowly, just drive as smoothly as possible. For example:
Acceleration is the biggest killer for mpg. So, once you get to your cruising speed, try to stay up there. If there's people in front, follow them from further back. That way, you can just lift off when they start to slow down, and engine brake, which will use little gas, and also, typically, they'll start to speed up again, and you won't have to brake at all.
Take corners properly (if it's safe to do so) to try to maintain your cruising speed (say 60mph). By not constantly accelerating and braking, you're going to use a lot less fuel.
Take that massive amplifier/cabinet/corpse from the boot (trunk) that you haven't been bothered to take out.
Close the windows. I'm also not sure about AC, I think it does have a reasonably noticeable effect though.
If you want to get serious about it, lose some weight. Take out the spare wheel and buy a can of that temporary 'get you home' foam stuff.
Hope that helps. My crappy 1.2 Clio gets me 45mpg ish with daily 54mile roundtrip to work. If I make sure I drive a bit slower and don't accelerate as harshly, it'll hold it's nose above 50mpg, but that does get a bit boring, and means I have to get up earlier...
Here
Point 25 on there also has this note:
NOTE: If you own a car with fuel injection, it is more efficient to keep the car in a high gear while going down hills. Fuel injected cars will shut off fuel flow to the injectors when coasting downhill in gear, as opposed to consuming fuel to keep the engine at idle while in neutral. Simply take your foot off the gas
But yeh, it's true. If you have an instantaneous mpg reading (or even one that does an average, just reset it and it's as good as instantaneous for a while)
Coast along in neutral (let's say downhill, to help keep you going) and it'll eventually max out somewhere (it may be off the scale, if so, use the range left reading, as that'll go up into thousands)
Now, put it into a high gear (so that engine friction isn't going to sloow you down to quickly) you'll notice that the mpg suddenly increases again (or range goes up again, depending on what you're looking at).
It works, I've done it in my car.
If you want more mpg, you don't necessarily have to drive slowly, just drive as smoothly as possible. For example:
Acceleration is the biggest killer for mpg. So, once you get to your cruising speed, try to stay up there. If there's people in front, follow them from further back. That way, you can just lift off when they start to slow down, and engine brake, which will use little gas, and also, typically, they'll start to speed up again, and you won't have to brake at all.
Take corners properly (if it's safe to do so) to try to maintain your cruising speed (say 60mph). By not constantly accelerating and braking, you're going to use a lot less fuel.
Take that massive amplifier/cabinet/corpse from the boot (trunk) that you haven't been bothered to take out.
Close the windows. I'm also not sure about AC, I think it does have a reasonably noticeable effect though.
If you want to get serious about it, lose some weight. Take out the spare wheel and buy a can of that temporary 'get you home' foam stuff.
Hope that helps. My crappy 1.2 Clio gets me 45mpg ish with daily 54mile roundtrip to work. If I make sure I drive a bit slower and don't accelerate as harshly, it'll hold it's nose above 50mpg, but that does get a bit boring, and means I have to get up earlier...
Here
Point 25 on there also has this note:
NOTE: If you own a car with fuel injection, it is more efficient to keep the car in a high gear while going down hills. Fuel injected cars will shut off fuel flow to the injectors when coasting downhill in gear, as opposed to consuming fuel to keep the engine at idle while in neutral. Simply take your foot off the gas
That's funny, because it's the GOVERNMENT that MAKES the numbers and forces them to be placed on the vehicles.
DrPizza
Administrator Elite Member Goat Whisperer
Sorry, but very little is "proven" on mythbusters. It's a show for entertainment. Also, at lower speeds, air resistance is all but negligible. (Make a giant cardboard car, run down the street with it. A little air resistance. Now, push the car. See how much harder it is to push the car.) Compare the air resistance to the resistance of pushing the car.
False, if the engine is turning more RPMs than the throttle position indicates, the injectors stop pumping.
iversonyin
Diamond Member
- Aug 12, 2004
- 3,303
- 0
- 76
I think some government agency did a test to this. At higher speed, wind drag does make a difference in car mileage. But I think for smaller car, A/C uses more gas than the lose of mileage cause by wind drag
Just a quick note, United States MPG are different the the MPG ratings everywhere else, since the US uses their own Imperial Gallon.
what does a MAF have to do with starting? and why would the detergents found in all gasoline not be enough to clean fuel injectors? why did you not recommend checking ignition or the air filter in that situation?
I just checked again after refueling my car...
In the city I'm getting 28 mpg.
On the highway, I'm getting 25 mpg.
I think it's a little strange that I'm getting worse milage on the highway than in the city.
In the city I'm getting 28 mpg.
On the highway, I'm getting 25 mpg.
I think it's a little strange that I'm getting worse milage on the highway than in the city.
TRENDING THREADS
-
Discussion Zen 5 Speculation (EPYC Turin and Strix Point/Granite Ridge - Ryzen 9000)- Started by DisEnchantment
- Replies: 25K
-
Discussion Intel Meteor, Arrow, Lunar & Panther Lakes + WCL Discussion Threads
- Started by Tigerick
- Replies: 23K
-
Discussion Intel current and future Lakes & Rapids thread- Started by TheF34RChannel
- Replies: 23K
-
-
Facebook
Twitter