Quote Originally Posted by DamienS View Post
I have read this thread and dont agree that you use less fuel in gear than you do in neutral. My 06 Subaru Liberty I owned had a trip computer that also measured instantaneous fuel use, whilst coasting down hills even in fifth you were still using a few litres per 100k's , where as if I had it in neutral down the same hill, it was using less than 1 litre per 100k's just keeping the engine idling.

Depends how/where ure trip computer gets its info from. If its only using VAC, then thats why its giving you those reading.

On this note, an auto VS commo, when put in first down a hill will read its trip computer as 0.0L/100km

A little test you could try, only in a manual:

1. find a nice long hill
2. put it an a gear and coast down the hill
3. Turn your car off and listen for a change in engine note.

If there is, it means when u turned off your car, injectors went off, thus ur car DOESNT save fuel.

If there isnt a change, it means your engine had ALREADY stopped fuel to save it.

To all those worried bout the dangers, ONLY DO THIS IN A MANUAL, your brakes WILL still work, as there still is vacuum and there WILL be power steering as that operated by a belt


Also, chances are a CARBY engine wont save petrol