Does this seem normal?

Stu- · Post by **Stu-** » Sat Jan 29, 2011 9:54 am

Engine temp to ecu wire not broken?

rollaholic · Post by **rollaholic** » Sat Jan 29, 2011 11:26 am

i've never done better than ~10l / 100km out of any of my 4ages

and will it even start with no CTS for ecu?

CAMB01 · Post by **CAMB01** » Sat Jan 29, 2011 12:59 pm

My EVO gets between 400km to 450km from a full tank of 98. Currently is costing me $98 to fill 45ish litres. Has a 50 litre tank.
Also i drive it mostly sedately, with a few on boost accellerations every now and again like going up hills or motorway on ramps.

iOnic · Post by **iOnic** » Sat Jan 29, 2011 5:07 pm

rollaholic wrote:
and will it even start with no CTS for ecu?

Yep. Will just constantly think it's cold so run rich.

FYADUP · Post by **FYADUP** » Thu Feb 10, 2011 8:41 am

Hey guys,

Sorry for the delay - had to go through a whole tank!

Well...

I filled my car up from a constant orange fuel light, so as dry as I deared to get it.

Went to Caltex

Used 95 @ $2.069 per litre

Filled the car up - 36.416 Litres @ $75.34

Drove it until I was just below a quarter of a tank, but was on the open road and had nowhere to stop for gas for a while, so I unfortunately had to put more in.

Went to Mobil

Synergy 5000 @ $2.119 per litre

Put in $30 worth - got 14.6 Litres.

So I continued to drive it until I had a constant orange light again.

I travelled 685km from $105.34 of gas @ 50.57 Litres.

This equates to 13.54km per Litre.

So i guess this is actually quite normal after all that?

But, in saying that - I usually never completely fill up during the week - usually a few lots of $20 fills at a time.

Would this change the fuel consumption as opposed to completely filling up when I needed to?

I would say 2/3 of this driving was 100km open road - As this past weekend I went from Auckland to Whangamata and back - also including driving everyday to work and back on the motorway.

Your thoughts...

Jason

1I1 · Post by **1I1** » Thu Feb 10, 2011 9:31 am

Perhaps because you are only putting $20 in at a time it feels like it using more petrol rather than just filling it from empty to full each time?

Similar thing was happening with me and my Corolla. Thought it was chewing gas but once I actually did a proper fill and saw how many k's I got it seemed normal

sergei · Post by **sergei** » Thu Feb 10, 2011 9:31 am

Your method is a bit flawed (never did full to full trip calculation), but never the less, the consumption seemed to be normal, and it should make no difference driving on $20 at a time on fuel consumption.

Post by **Mr Revhead** » Thu Feb 10, 2011 9:38 am

Yeah to need to fill it to the brim, drive till empty, fill to brim again and take note of exact Ks and Litres. Do that a few times to get a good average.

tsoob · Post by **tsoob** » Thu Feb 10, 2011 11:06 am

1I1 wrote:Perhaps because you are only putting $20 in at a time it feels like it using more petrol rather than just filling it from empty to full each time?

Fill it all the way each time.

Malcolm · Post by **Malcolm** » Thu Feb 10, 2011 11:51 am

you'll get better fuel economy if you keep it near empty due to the reduced weight

sergei · Post by **sergei** » Thu Feb 10, 2011 12:12 pm

Malcolm wrote:you'll get better fuel economy if you keep it near empty due to the reduced weight

I know you are not 100% serious, but for some people without sense of humour I will break this down:

40L of petrol is 33.5kg of weight.
Assuming weight of the vehicle is roughly 1300kg with driver, 33.5kg is just 2.6%. Those 2.6% will not work out in direct fuel economy gain either, as huge percentage of work done propelling a car is used on drag and friction. So perhaps it will make ~1% difference...

Running higher pressure in tyres does a lot more, so does driving sensibly.

sergei · Post by **sergei** » Thu Feb 10, 2011 12:18 pm

If you are into fuel economy, do the following:
put 165 or 175 low roll resistance tyres,
pump them up to 3Bars,
0 or 5W30 oil in the engine,
synthetic 75W oil in the gearbox,
lower it,
underbody tray
smaller battery

But again 4AGE is not a very good base engine for this purpose.

Post by **Mr Revhead** » Thu Feb 10, 2011 12:19 pm

Stuff driving around with tyres like that. Especially in the wet

sergei · Post by **sergei** » Thu Feb 10, 2011 12:25 pm

Mr Revhead wrote:Stuff driving around with tyres like that. Especially in the wet

Yeah, hence I am not into fuel economy. well not in next 30 year at least.
Then I will just go electric or something.

But tyres make huge difference in fuel economy.

sergei · Post by **sergei** » Thu Feb 10, 2011 12:47 pm

Here is more speculation on the topic running on low will lead better fuel economy:

1L or petrol produces ~ 6-7MJ of energy.
it takes ~13kJ to propel 33.5kg to 100kph (E=0.5*m*v^2).
in other words ~0.2% of said 1L of petrol or ~2mL.
So each time you accelerate full tank to 100kph it takes extra 2mL (or cc) of gas. Remember your injectors are capable of injecting ~ 210-290cc x4 per minute at full load.

tsoob · Post by **tsoob** » Thu Feb 10, 2011 4:33 pm

do more skids.

allencr · Post by **allencr** » Thu Feb 10, 2011 6:43 pm

FYADUP wrote:Hey guys,
Sorry for the delay - had to go through a whole tank!
Your thoughts...

Wasted post.
:roll:

Fill it up.
Drive it.
Fill it up, noting the amount OF FUEL & DISTANCE.
Divide distance by fuel, That's $&#$% It![/b]

BZG Wagon · Post by **BZG Wagon** » Thu Feb 10, 2011 6:56 pm

tsoob wrote:do more skids.

Said the tyre-shop owner.

Adamal · Post by **Adamal** » Thu Feb 10, 2011 7:26 pm

sergei wrote: driving sensibly.

WHAT IZ DIS?

Akane · Post by **Akane** » Thu Feb 10, 2011 8:28 pm

sergei wrote:Here is more speculation on the topic running on low will lead better fuel economy:

1L or petrol produces ~ 6-7MJ of energy.
it takes ~13kJ to propel 33.5kg to 100kph (E=0.5*m*v^2).
in other words ~0.2% of said 1L of petrol or ~2mL.
So each time you accelerate full tank to 100kph it takes extra 2mL (or cc) of gas. Remember your injectors are capable of injecting ~ 210-290cc x4 per minute at full load.

Did you factor in that the chemical energy is produced in heat and sound as well?