So is it true that the automatic 2008 accents get higher mpg on the highway then manuals? not sure about city driving

Automatics get slighty more mpg highway manuals get alot more mpg in city driving. :00000732:

This post has been edited by TroyHansen: Jun 10 2008, 08:51 AM

Yep, tis true! The automatic is geared different, they pull lower RPM's at cruise than the manual.

Mileage does suffer in the city though, the manual beats the auto in that department.

ahh that makes it clear, thankyou

Alot depends on your driving too. I hit 38.7 MPGs last fuel up with manual on my base 08.

Here's what helps:

1. Don't idle - for me warm up is exactly long enough to put the seat belt on and engage the gear shift.
2. Use neutral as much as possible when applicable - down hill for example. I found certain areas around my house where I can coast in neatral for about a mile. It really helps.
3. Use 4 PSI more in your tires that standard 30. Especially if you drive alot of highway.
4. Don't shift higher than 2.5-3k unless you need to.
5. Don't use your headlights or fan unless you need them. (Yeah, that's pushing it but it really helps. Load on your alternator will impact your fuel consumption. Basically, don't run your lights during the day, or fan / heater unless necessary).
6. Speed between 55-65 will yield the best fuel / RPM combination.
7. Don't engine brake - if your engine revs up, fuel consumption increases.

:)

a couple of corrections, one never take your car out of gear and roll it is very dangerous as stated int he manual and also kills economy, better off putting it in a high gear and letting the wheels turn the engine, also engine breaking is key to good economy the wheels also turn the engine no gasoline is wasted here until you idle that is why the manual transmissions get so much better mpg in the city.

Troy, I respectfully disagree.

I still maintain full control over my vehicle even when coasting in neutral. Trick is to match the RPM when engaging gears. Obviously if you're in the highway, you have to rev the engine up before engaging drive train again. If in the city, it's a bit less crucial, but still important. When you're coasting at 600-700 RPM, I give you 150% certainty guarantee, that you use 1/4 of the fuel than you would use if driving the same speed with 2000-2400 RPM in gear. Basic mechanics, comrade.

Also, any increase in RPM will increase your fuel consumption - engine has to use gas to work, so if you engine brake - your RPM goes up and so does your fuel usage.

Again, I am not suggesting everyone drive like me, but this is what gives me the mileage that I get.

Were you mostly on the highway? My wife drives her Accent mostly to work which is a mix of stop & go, highway, country, & city getting 32+MPG(& rising after a cold long winter). When I get to drive it(usually to her mom's place on the highway), the tank has her work driving mostly on it. But it starts hitting 34 to 35MPG. I might think a full highway tank might get 37 to 38MPG.

I'm not sure if that's true. I believe these fuel systems cut the fuel off to the engine during engine braking. I haven't read up on it too much, that's just what I've read on various threads. Can anyone else comment on that?

Here is a q/a from another site that I posted:

How should I be driving my manual accent for the best FE when slowing down? Should I be shifting to neutral or letting it slow down in gear? I don't know how the DFCO works on my car and I can't really find any info on it. I'd like to get a scangauge but I don't want to spend the money right now.

Kuripot


kuripot;

Take a long phillips head screwdriver, place the handle on your ear and the point on the fuel injector body (any injector, doesnt matter). You should be able to hear the injector ticking as it works (engine running of course).

Rev the engine up and release all throttle, you should hear the speed of the ticking go up, and if you let off the throttle completely the injector ticking should stop completely and start again when the engine is at idle RPM.

Staying in gear with no pressure on the accelerator pedal does the same thing. Instead of using fuel idling, you are eliminating all fuel delivery to the engine. It can save you a lot of fuel in stop and go driving.

I like to stay in top gear until my revs get down to about 1000 RPM, then downshift to keep the revs above 1000. If you do it right you will be in the right gear when it becomes necessary to reaccelerate.

regards
gary

This post has been edited by Kuripot: Jun 18 2008, 10:54 AM

that's what I've been reading too.. engine overrun or something like that.
im a recovering N user and have just been engine breaking usually..
if anyone can confirm or deny that there IS a fuel cut off while coasting in gear that'd prob. help a bit here.

This post has been edited by onetwenty: Jun 18 2008, 10:53 AM

there is lol and thats what im trying to say as long as the car is in gear and you are not touching the gas pedal then there is no gas wasted as if you were in neutral and roll to a stop

But im just saying its not recommended to take your car out of gear when your driving at higher speeds, just isnt safe but you can drive how you'd like....

And you have the whole engine breaking thing backwards, it doesnt take fuel to run the engine at high rpm none the less more fuel, wheels turn the engine...

during engine breaking the injectors are cut off.

The only type of cars that use gas while coasting in gear or engine breaking are carbureted cars.

This post has been edited by TroyHansen: Jun 18 2008, 12:42 PM

Older cars (especially carburated ) used vacuum to draw in fuel.If the engine turned Fuel was "used".
Our car's ecu reads rpm's, throttle position, manifold absolute pressure ,air/fuel ratio(oxygen sensor),as well as others to adjust fuel.
When the tps shows a closed throttle and the rpms are above preset idle the fuel flow is shut off to avoid a rich mixture at the o2 sensors,until the rpms reach the preset idle constant.Regardless of map(vacuum).
When the tps shows movement the fuel idle circuit is then engaged .
Fuel flow is then adjusted by the ecu to maintain proper air/fuel ratio to avoid problems.
This prevents excess fuel build up which can cause sparkplug fouling due to core saturation,catylitic converter degradation due to fuel contamination,and excessively thin oil or bearing wash caused by unused fuel leaking down into the pan.All this ,prolonged engine life and maintainance requirements,and improved fuel economy.
If you don't believe it cut the ignition off (stick) coast a few seconds and turn ignition back on.
If there was fuel being fed during the coast you would experience a sudden explosion of unburned fuel in th exhaust system.(Though not recommended). :whistling:
:57:

well put, tango
:trophy:

i think im gonna experiment!! next tank i will engine brake on my trips... the tank after that, i will be an "N" user and coast.... i'll let y'all know... not real sure how im going to keep it accurate as mine as well as everyones MPG's fluctuate... we'll see..

theres gonna be an obvious outcome engine breaking is better lol it was one of the first things my dad taught me about driving stick, he said if you coast in nuetral you are waisting gas...

I never coast in neutral because in the owners manual it says that you should always drive in gear. Do not roll in neutral.

I usually just roll it a little bit in neutral when I'm stopping at a red light.

Oh, wow! Coasting in neutral is dangerous. Anyone that let's their kids soapbox race is guilty of child abuse! Call up the court system to put a stop to it.

Guys, all I am saying is that I get (repeatedly) 38.7 MPGs with the way I drive. If you think there's a better way of saving gas, by all means reasearch the alternative and tell us about it. I am all ears as far as that goes. However, I deeply doubt you can do better than coasting in neutral down hills, except maybe shutting the engine off in the same time.

I put out a challenge to get better MPGs in city/highway driving than my 38.7.

Re-edit: "However, I deeply doubt you can do anything more dangerous than coasting in neutral down hills, except maybe shutting the engine off in the same time. "

lol j/k

This post has been edited by rondy_: Jul 2 2008, 01:36 PM