coasting. in gear and fuel use random thought.

[bobthecabbage]

Originally Posted by bobthecabbage

I thought I'd throw this into the mix.

Subjectively along levelish/ very gentle inclines I seem to use less fuel in 4th at 60mph than I do in 5th at 60mph.

Of course it would increase engine wear and is noisy compared to cruising along in 5th!

Anyone want to try and throw some light on that?

I wondered if my maf was a bit knackered and therefore not reading correctly at low air flows? Therefore 4th at 2700rpm odd is better than 5th at 2000 odd rpm.

Another thought was that the turbo is a bit worn and therefore works better at higher rpm?

Might try the same run in 4th at 60 all the way and also seeing what happens at 70 in 5th.

[patrick264]

Originally Posted by Lancee

Just a couple of queries re; your post.

1. "Seems like letting the car run downhill in gear without touching the accelerator uses less fuel then sitting at lights in neutral at idle".

I am wondering upon what information did you base this?


2. "just a hypothetical thought that came into my mind as I COASTED in fifth gear along a mile long downhill straight"

Was that coasted (out of gear), or "run downhill in gear" ?

Thanks'.

Hi. Run downhill in gear without using the accelerator. I think I was in fifth then changed to 4th as speed built up.