Shell V-Power experiment data/ 3.0si MPG

[EdButler]

Coasting in neutral is not as fuel efficient as coasting in gear due to the ecu fuel shut off occurring in gear. You burn fuel in neutral and burn no fuel coasting in gear.
Regards

However coasting in gear slows the car down much more as you're adding the drag of the gearbox and an extra multiple of engine friction and pumping losses/vacuum per 800rpm.

You definitely save fuel coasting in neutral provided you want to keep the speed, although its a bit naughty.

 

[Scooba_Steve]

Just my two pennies...
On motorway trips I am getting 38 mpg at 70mph, around 32 mpg with mixed town and motorway/dual carriageway and around 25 mpg for local trips.

With what fuel type Scooba?

Running whatever the ESSO higher octane is as it's my closest garage. Would be interested to see if V-Power or other brands make much of a difference.

It would be interesting to get some actual data regarding the coasting/fuel shut off; I certainly don't feel much engine braking in the highest suitable gear and would like to think the manufacturers wouldn't add such a feature unless it did make a difference. They may just make the assumption that drivers don't coast or it may make a difference in the emissions testing (doubtful though).

 

[Brizza]

Just had a read through these posts, i'm defo tempted to give the V-Power a go. I drive the 3.0i, and normal everyday commuting gives me around 31.5mpg. That's a mix of 35-45mph driving and stationery traffic over a 25 minute period. Motorway driving (70-80mph) gives me just over 40mpg - pretty happy with that.
:driving:

 

[Hadies]

Am I the only one who gets depressed reading mpg posts? I only get 24 from my coupe.

 

[Smartbear]

Coasting in neutral is not as fuel efficient as coasting in gear due to the ecu fuel shut off occurring in gear. You burn fuel in neutral and burn no fuel coasting in gear.
Regards

However coasting in gear slows the car down much more as you're adding the drag of the gearbox and an extra multiple of engine friction and pumping losses/vacuum per 800rpm.

You definitely save fuel coasting in neutral provided you want to keep the speed, although its a bit naughty.

I'm assuming downhill sections or coasting towards junctions etc where you would want to slow down & stop anyways, coasting in gear in these situations is definitely more economic, even on the flat people practice pulse & coast to maximize range.