getting better mpg

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?

37.8 mpg from SZ5, running BFG AT, roof bars, bike carrier, awning and occasionally a roof load [bike, ladder, canoe etc.]

Never seen 40mpg but no grounds for complaint.

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

danielbz wrote:

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.

Lambert wrote:

saxj wrote:

Lambert wrote:

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.

danielbz wrote:

im using a non traffic road, i drive 50 mph when going uphill and i go downhill in N, im not in the UK, what mods do you have?

ATs, winch bumper and some other bits.
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Is your vehicle standard?

I assume if putting it in N it is a manual not an automatic.

danielbz wrote:

US gallon
91 octane, no ethanol

Curious, where are you?

Do you know what Octane scale you use?

91 octane in the USA at least, would be about the same as 95RON here in the UK.

Old wrote:

Can you use 91 in a series 4 my series 3 staits minimum 95 ?

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Depends where in the world they are. Octane is rated in different ways.

en.wikipedia.org/wiki/Octane_rating

Bill wrote:

My very standard gen 4 still achieving a lifetime average of over 42mpg (UK). No motorways near me but otherwise regular A & B road driving. I rarely cane it though. 

I'd suggest over 40mpg is not the norm for most Jimny's. You really do need to drive it very gently to attain that (never managed it in mine, even when 100% stock).

saxj wrote:

Lambert wrote:

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.

No, neutral will be at idle and still pumping fuel in. Using engine braking will be no fuel and potentially more economical.

i was going down in N, my car is automatic, i will take into consideration what you told me, knowing that modern cars have more stuff included it may be true that going down in D stops fuel injection, i just had not thought about that before, thanks