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Am I right is claiming that shifting to neutral at stops increases FE?

I know it helps while the car is coasting. But I've also noticed that both my GPH and LOD drop when I shift to neutral while at a standstill.

My car, a Sonata 1999, saves about as much going from drive to neutral as I do when I turn off the AC. BTW, I have an AT.

Of course, we can save even more by turning the engine off completely. But sometimes it is not practical to do so. Neutral is the next best option.

Yes, you are correct. When you put it in neutral you eliminate the effort to turn the drivetrain components. Less drag/resistance means less fuel used. The RPM should go up a tad because of reduction in load.

Here are my results from a quick check. All at a standstill.


Neutral no AC...RPM...700...LOD...16.

Neutral wi AC...RPM...860...LOD...22.

Drive no AC.....RPM...760...LOD...22.

Drive wi AC.....RPM...760...LOD...31.


Does the LOD difference between 16 and 31 mean that I am using almost twice as much gas when I am at a standstill in Drive with the AC on vs Neutral no AC?

Here are my results from a quick check. All at a standstill.
Neutral no AC...RPM...700...LOD...16.
Neutral wi AC...RPM...860...LOD...22.
Drive no AC.....RPM...760...LOD...22.
Drive wi AC.....RPM...760...LOD...31.

Does the LOD difference between 16 and 31 mean that I am using almost twice as much gas when I am at a standstill in Drive with the AC on vs Neutral no AC?

Did you measure GPH (gallons per hour) for each of these? Those figures who be the most useful.

Hi Fuzzy,

Unfortunately my GPH gauge does not work, nor does my MPG.
1999 Sonatas are one of the few cars that are not compatible with SG.
Wayne has confirmed this.:(

Is that not something that can be addressed with a different cable (as mentioned in other threads -- affecting Mitsubishi and Hyundai models)?

Is that not something that can be addressed with a different cable (as mentioned in other threads -- affecting Mitsubishi and Hyundai models)?

This is exactly right. Call up Linear Logic and let them know the problem, they will gladly send you the second cable. I tried going back to the first cable in my avenger but it killed half my gauges and I switched right back. I keep it in case I need to use it on a different car.

Is that not something that can be addressed with a different cable (as mentioned in other threads -- affecting Mitsubishi and Hyundai models)?

That's great news. First I've heard of that. Wayne didn't mention a second cable. He just said that with the 1999 Sonata, Hyundai didn't follow the proper protocol when installing the OBDII plug.

I'll give Linear Logic a call on Monday.:Banane17::Banane27::Banane51:

Thanks guys.

BTW, when the SG is plugged in, somehow it knocks out my odometer and speedometer. My car records zero miles as I drive.

Sounds like the cable is exactly what you need if the speedo and odo are affected!

Good luck!