Ultragauge/Scan Gauge owners report

that could very easily be the case, as when you're engine braking, you'll not be using any fuel, but you'll also be slowing down considerably since the axle is basically powering the engine. When in neutral, you've disconnected the axle from the engine, so you no longer have all that extra drag to maintain speed (on declines). Coasting (and maintaining speed) is by far best out of gear, while slowing down is by far best in gear. Its really not a one or the other for normal driving, but when to use each one.

Both methods can be used for mpg savings although the engine braking method seems to do more overall due to the driver planning their stops a lot better (slower stops means less energy was used to get up to/maintain speed, therefore less is wasted when pressing the brakes)

Some of the more dedicated people actually kill the engine when they put it in neutral and pop the clutch to get it started again, but the wear and tear on the clutch and trans makes it so not worth the mpg savings in my book.

 

Mine still reads higher just coasting in neutral rather than shifting down to say 3rd going 40-50 mph. I don't know if the Torque app would say "infinite" but like I said the highest I've seen was 191 mpg.

 

Just a bit of info for those 4 bangers running larger tires...maybe try going a little quicker on your freeway driving and see how it goes. For me and my 33.1" tires im driving around 68~70 for optimal fuel economy

 

Back in the day a vacuum guage's would help and still could help getting the best MPG,if price is an issue with an electronic device.

It's easy, the higher the vacuum reading the better will be your gas mileage.

http://www.jcwhitney.com/miles-per-gallon-gauge/p2008961.jcwx?filterid=c26838j1