OK, So I've made it a game trying to get the best MPG possible each trip or trying to raise my MPG on each trip. I went from coasting in Drive down hills to throwing it in Neutral going down hills and have noticed MPG MUCH MUCH Higher than normal. The only question is, when I throw it back into Drive, the RPM's jump to near 3K (have not seen it hit 3K yet but not too far off) and I do feel a TINY TINY .... "jerk" I guess you could say. Will this hurt my engine/transmission doing this? I am LOVING the 38MPG readout (have gotten up to 42MPG one trip ), but if it will hurt the car, it is not worth the "3-4MPG" (per readout). BTW: This is an Automatic
What say you guys?
*THANK YOU IN ADVANCE*
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2009 Magnetic Gray Metallic Corolla LE ^Click For My CarDomain Page^ Team HAMSTER™
When I go down hills on my way to work keeping it in gear with no foot on the gas is a much better option the in neutral (car km/100lt is 0.0(in gear) compared to about 3km/100lt(neutral)), however the hill is steep enough to keep the cars speed at 60mph with the A/C on, I do not know if down the hill while in gear if you need to accelerate to keep up the speed.
I am no car expert but using gravity to power the engine should be more fuel efficient then using gas to idle it.
if your not pressing the gas down hill, its basically as if the car is in neutral. it may seem like your using less gas by putting it in neutral, but automatic cars are not manual cars, its not meant to be put into neutral like that. unless you come to a complete stop when its in neutral and then throw it back to gear, then yeah go for it.
I do not use AC, I have windows. and the hills are nice and long, so i can coast and maintain or even gain speed. What I am worried about it the throwing it back down into Drive. Will that hurt the trans/engine?
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2009 Magnetic Gray Metallic Corolla LE ^Click For My CarDomain Page^ Team HAMSTER™
if your not pressing the gas down hill, its basically as if the car is in neutral. it may seem like your using less gas by putting it in neutral, but automatic cars are not manual cars, its not meant to be put into neutral like that. unless you come to a complete stop when its in neutral and then throw it back to gear, then yeah go for it.
when coastin in Drive, RPM's are around 2 1/2K... when in Neutral RPM's are under 1K. Would appear to use MUCH less gass. But question remains, does it hurt tranny/engine to throw it back into Drive after the hill?
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2009 Magnetic Gray Metallic Corolla LE ^Click For My CarDomain Page^ Team HAMSTER™
When I go down hills on my way to work keeping it in gear with no foot on the gas is a much better option the in neutral (car km/100lt is 0.0(in gear) compared to about 3km/100lt(neutral)), .....
The reason why it reads 0.0L/100km while in "D" while going downhill is because the ECM has engaged de-acceleration fuel cut...or it shut the fuel off. This will always yield better fuel economy than idling in neutral. Plus its safer as it is under engine braking control. Also its hard on your auto tranny to be engaged into "D" from "N" while moving. Even while idling at a stop light there is no need to, so don't do it.
__________________ '09 Corolla CE Enhanced Auto
TRD Springs/Sway/Xrs FSB by Yamaha
Lifetime : 6.121L/100km(38.714mpgUS)
Maximum: 5.082L/100km(46.287mpgUS)
(manually calculated) (original unflashed factory ECM code)
OK, my RPM as well as MPG readout shows coasting in N is far better on gas than coasting in D. The car also goes faster coasting down the hills in N vs D. But shifting from N to D while moving is not good on the engine/trans. is my concern.
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2009 Magnetic Gray Metallic Corolla LE ^Click For My CarDomain Page^ Team HAMSTER™
shifting from N to D will slowly diminish the life of your trans if youre moving. It might seem like going down hills on N saves more gas but it also wears the brakes more because you dont have engine braking.
but N has about 1k rpm because the engine isnt doing work, basicly idling. When thrown into D the engine is doing work because of the speed you are at.
OK, So I've made it a game trying to get the best MPG possible each trip or trying to raise my MPG on each trip. I went from coasting in Drive down hills to throwing it in Neutral going down hills and have noticed MPG MUCH MUCH Higher than normal. The only question is, when I throw it back into Drive, the RPM's jump to near 3K (have not seen it hit 3K yet but not too far off) and I do feel a TINY TINY .... "jerk" I guess you could say. Will this hurt my engine/transmission doing this? I am LOVING the 38MPG readout (have gotten up to 42MPG one trip ), but if it will hurt the car, it is not worth the "3-4MPG" (per readout). BTW: This is an Automatic
What say you guys?
*THANK YOU IN ADVANCE*
You will use less gas with the car in gear if you don't have to have your foot on the gas pedal. The engine isn't using any fuel as it's running on a vacuum while also engine braking when you are in gear without the gas pedal depressed. I've also heard that the transmission fluid is not effective when your auto is in neutral when going at speed in N & that will also wear out your transmission faster.
So in short, leave it & gear for the sake of your transmission & you'll also get better MPG.
__________________ 89 Supercharged White MR2 5-speed / 09 Corolla S CSM 5-speed
07 Matrix XR Gray Pearl 5-speed (sold 11/23/11)/ 94 Corolla DX Red 5-speed / 95 Previa S/C White Auto/
07 Corolla CE CSM 5-speed/ 10 Prius III Blizzard Pearl
I KNOW I get better MPG via Neutral. I've done the trip M-F coasting in D and then coasting in N several times each. Each time MPG readout is better (by 3-5mpg) in N. BUT if it will hurt the trans/engine in ANY way, it is not worth it.
Thanks all!
__________________
2009 Magnetic Gray Metallic Corolla LE ^Click For My CarDomain Page^ Team HAMSTER™
I KNOW I get better MPG via Neutral. I've done the trip M-F coasting in D and then coasting in N several times each. Each time MPG readout is better (by 3-5mpg) in N. BUT if it will hurt the trans/engine in ANY way, it is not worth it.
Thanks all!
Greg, I'm just curious, is it just your readout that shows the increase or did you also compute actual mpg over several tanks? I'm wondering if the coasting in N was making the error larger on the computer readout.
__________________ 89 Supercharged White MR2 5-speed / 09 Corolla S CSM 5-speed
07 Matrix XR Gray Pearl 5-speed (sold 11/23/11)/ 94 Corolla DX Red 5-speed / 95 Previa S/C White Auto/
07 Corolla CE CSM 5-speed/ 10 Prius III Blizzard Pearl
I did the computing as well. Came out about the same. MPG readout is not much diff in my car 1-2mpg
Very interesting.
__________________ 89 Supercharged White MR2 5-speed / 09 Corolla S CSM 5-speed
07 Matrix XR Gray Pearl 5-speed (sold 11/23/11)/ 94 Corolla DX Red 5-speed / 95 Previa S/C White Auto/
07 Corolla CE CSM 5-speed/ 10 Prius III Blizzard Pearl
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K2
), but if it will hurt the car, it is not worth the "3-4MPG" (per readout). BTW: This is an Automatic
2009 Toyota Corolla
Sylvia
Linear Mode
