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Driving down hill in neutral that is coasting is not good. First it reduces your control of the vehicle as you have no engine braking effect which in turn increases reliance on the wheel brakes which can cause them to overheat. Secondly the engine will revert to idle in neutral which requires it to burn fuel, when going down hill in gear the ECU detects this and virtually stops fuel supply, the effect may be small but it does increase mpg.
Great theory, but in practice coasting in neutral uses less fuel.
Maybe on a carburettor motor but it's one of the ways modern European compliant engines meet emissions.
Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!
so, does going on D shuts down fuel injection? where can i see that??
and going on N does not stops fuel injection? i didnt know about that, is there somewhere i can check this?
An imperial gallon is 20% bigger, so that takes your 29 to almost 35mpg.
I don't have any figures for 91 octane rating vs 95 we get in the UK, but would expect another increase in mpg, possibly as much as 5%. So that takes you up to about 36.5mpg.
The ECU needs to be able to adjust to the different octane ratings, but I assume they do this, or the ECU is 'tuned' for the market the vehicle is going in to.
Several years ago I hired a Jimny on holiday in the Caribbean, it seemed to drink fuel and it wasn't cheap, so I worked out the mpg, it wasn't very good, I put it down to the state of the roads. Only later did I realise that although the island used to be under British rule, pertrol was sold in US gallons.
I think you are not that far away. You might check the air filter or the CAT might have disintegrated, then again check the plugs and everything else, depending on how many miles your vehicle has done.
Robin
2020 blue SZ5 (one of the last to be registered in the UK)
Ex 2011 Blue Jimny SZ4
Northumberland Jimny Blog
so, does going on D shuts down fuel injection? where can i see that??
and going on N does not stops fuel injection? i didnt know about that, is there somewhere i can check this?
Yes it does. You can see it on the instant consumption gauge on the Gen 4.
Driving down hill in neutral that is coasting is not good. First it reduces your control of the vehicle as you have no engine braking effect which in turn increases reliance on the wheel brakes which can cause them to overheat. Secondly the engine will revert to idle in neutral which requires it to burn fuel, when going down hill in gear the ECU detects this and virtually stops fuel supply, the effect may be small but it does increase mpg.
Great theory, but in practice coasting in neutral uses less fuel.
Maybe on a carburettor motor but it's one of the ways modern European compliant engines meet emissions.
It's all about friction and momentum, you go further in neutral than you will with your foot off the throttle, so it uses less fuel. I used to live in a hilly area, and it used to make quite a difference to my consumption - Gen 3 manual and Gen 4 Auto. Now I live in a very flat area, so I don't get the advantage any more.
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