I've said it time and time again.

WB will read off the charts in the above situation (19.9). If in neutral, it will try and maintain 14.7 and actually require more fuel.

 

^^ I tried the neutral thing one roadtrip and got 506 miles out of one tank instead of my usual 420 at the time...now my mileage is lucky to see 350 for a tank. A 'rear bank cat failure' is the main culprit, so I'm in the process of building a new y-pipe and 3" exhaust to gain my mileage back

 

that's interesting tcb_02_max and Nmexmax. I did not know that the car actually uses less gas when left in gear as opposed to neutral.

Now, I'm sure that both of you know that when left in gear, the distance you can coast is shortened and the car's speed drops much faster. In that case, you must make the car accelerate once again later on rather than letting it pick up speed. So which way would you say is more fuel efficient depending on terrain?

On flat ground coasting to a light, keep in gear and on a downhill neutral? Or are you saying that its better if your on a hill to keep it in gear and accelerate periodically?

 

If you really have a long grade, drop it into neutral and kill the engine - with the realization that you no longer will have power steering (fine at speed) or a brake booster (not so fine...). So, do this at your own risk / depending on traffic and other conditions.

And, yes, you raise an interesting/old debate (constant speed vs. coast+gentle acceleration)... I have no pat answer on that one.

 

I wouldn't purposely kill the engine while the car is in motion just to save gas since it is risky because of not being able to brake, although I do know this is a technique used by hypermilers.

Guess I'd have to experiment to see which way I'd prefer. Neutral or in gear + slight gas. I feel like it'd be hard for a person to distinguish when is the proper time to accelerate and release so as to not waste more gas than neutral. I'm assuming the savings would be minute.

 

let off the gas when you know you need to slow down, minimal braking = greater MPG.

NismoMax80 has a post or a thread in the 6th gen forum and a link to another forum, and some of those guys are out of hand the another forum, so much as to modify their cars for minimal drag.

I've noticed the "I know I will need to brake so imma chill on the throttle" deal to help quite a bit coupled with lightweight wheels. As stated numerous times before, 12-15% with my lightweight wheels.