Anyone tried this to save gas

Seems to me this practice would use more clutch. In and out to maintain speed vs just leaving it 5th and applying throttle as needed. I don't coast regardless of laws. Been getting around 23 mph overall.

 

I'm referring to the fact that I use N and apply the brakes to slow down as opposed to downshifting from 5th to 4th to 3rd to...well, you get the idea.

 

K. That makes sense. Brakes are cheaper than a clutch. I do that. Taught my girlfriends daughter to do that too. She's taken a few miles off my clutch already.

 

If you use a wideband you would see that leaving it in gear will make your engine go lean (saves gas) as apposed to leaving it in neutral where your A/R's would be somewhere around 14:1 a/f at idle in neutral while coasting depending on duty cycle, injector size etc.

 

That's what I figured... I don't have an actual scanguage it's a smartphone app but I'm sure it works off the same programming. I usually can get a reading of up to about 160 mpg coasting in neutral vs about 60 same speed if coasting in like 5th. I'll try not neutral coasting for awhile and see what that does.

 

Yeah, heaven forbid you have power for emergency maneuvering while descending a grade....

It's a law because someone somewhere died because some jacknuts who couldn't control his vehicle slammed through someone else while coasting downhill.

All in all, this is probably a pretty toothless (not to mention, unproveable) law.

 

always coast in neutral, 24+ mpg out of my modded truck

 

When you have a lot of open road in front of you, or a gentle decline, then coast in N as far as you can. If you're in traffic or there's only a small hill in front of you, then engine brake. If you get really ballsy, you can turn your truck off for long stretches. But I don't really recommend doing that.

 

im going to continue neutral coasting the roads out here are great 4 it usualy i coast to stop signs since there are so many with short distances between no steep grades

 

so automatic is illegal ???? because every time you let go of the pedal on an automatic it like having it on neutral?????????????? unless you throw it in 2nd or low gear. WE ALL RIDE DIRTY........ BECAUSE COPS FIND WHATEVER REASON TO F%#K YOU UP, EVEN IF ITS 100% STOCK.

 

Auto's don't shift to N when you let off the throttle.

 

I coast in reverse because it makes the injectors suck in fuel.

 

if only people were enlightened like us, we wouldn't have these fuel prices.

 

i didn't say it shifts to neutral i know it doesn't but im just saying it's alike....... You cant shift down unless you put it to 2nd or low gear

 

I do this too? Thats how i was taught

 

^^^ This is correct. That's why you can still hear the engine, and in some cases it's louder.

Correct, the only way to really have an accurate figure is using a wideband.

I feel the same way...in order to shift to nuetral you have to push in the clutch. If you just leave it in gear, you don't have to use the clutch at all. Regardless of using the clutch or not, you will see almost zero premature clutch wear by doing that. You wear out a clutch but riding the clutch and generating heat. Typical shifting of gears does not create much additional heat on the clutch disc. Starting the vehicle off from a stop creates way more heat on the clutch disc than shifting gears ever will.

I used to have a wide band system in my last vehicle to keep track of my AFR's because I was turbocharged. When coasting down a hill in gear, my wide band readout would display LEAN which means my AFR's were greater than 16:1. When coasting in neutral (essentially idling) my wide band would display my AFR's around 14.7ish (Stoic). This means I was using less fuel by coasting in gear. This was because my injectors were shut off by the ecu when coasting in gear as previously stated 100x.

 

Good god, anybody try going even 35 MPH in 5th with the 2.7? I would guess my truck experiences about a 7.6 vibration on the Richter scale...

 

Chicken

 

NO!

 

For many situations in gear with deceleration fuel cutoff (dfco) you are better off, headed down long grades where you are gonna be braking anyway, coming off the interstate at 80 and slowing down.

But for my normal daily commute there are very few if any times I'm better off coasting in gear vs coasting much much longer in N. The max speed on my commute is a short stretch of 55, and the rest 45 which I can do in 5th gear. At those speeds I'm at the rpm where dfco won't kick in or only momentarily as I slow down way to fast to make it to the stop.

Any attempts I make at trying to maximize dfco turns into a whole lot more downshifting to keep in the rpm range that works, and puts more wear on the clutch than simple popping into N once.

But then I'm coasting in N already, why not shut off the motor.