NEW Hypermiling thread

[audiophool]

Originally Posted by Helihover

This is something I've always wondered about. So is the FIS injecting less fuel than what is needed to idle to bring down the rpms?

Also, a car going up hill in say 5th gear @ 2000 rpms @ 75% throttle. Same car going up the same hill, same speed, in 3rd gear @ 4000 rpms @ 25% throttle. Which one is getting better fuel mileage? My thoughts are if the car is FI, it would be the 5th gear and opposite for a carbureted car.

Any thoughts?

If you're going down hill coasting in top gear and keeping your speed, the FI is not injecting fuel. If you put it in neutral the FI needs to provide fuel to make the engine idle, then you'll need to brake to maintain your speed. Yes, lifting in gear slows the car down. Is putting it in neutral and back in gear at speed going to cause excessive wear on the AT?

For my money, just avoid tromping the gas and unnecessary braking to get decent economy. Make sure your tires are properly inflated and get excess crap out of your car to keep the weight to a minimum.

One day I was stuck behind some turd in a Civic doing 80kph in a 110 zone and had a "Don't Honk I'm Hypermiling" sign on his trunk. I kinda wanted to punt him into the ditch...