Fuel consumption

**Blknight.aus** · 1st October 2007, 09:49 PM

I made an educated guess (see thats different to an assumption) as to what he was trying to get at the questions as I presented it are how I interpreted what he asked in my first reply.

Im fairly certain that If Id taken more time and effort I could have presented that last post in a nicer manner

But at the end of the day At best this kind of things is purely speculative to give you an idea as to where your test results might take you and as I alluded to in my second post the best way is to actually do it in a minimal variation environment IE on a dyno.

**001525** · 1st October 2007, 09:54 PM

No need to get personal. My husband has never left my side since the day I met him. We're both deeply in love and we were pioneers in same sex marriages. You should give it a try before you knock it. I'm with RonMcGr. It's such a non significant question and topic. Traveler, you need to harden up.

**Traveler** · 1st October 2007, 10:08 PM

Originally Posted by awabbit6

I think it is just the one question, but it is contradictory.
The cars can not be identical if they require a different number of engine revolutions (not rpm as Barry correctly pointed out) to achieve the same journey.

There will be a way to calculate an approximate answer to this, but the complexity required for an approximation will not make it worthwhile. There are some questions that are best answered through experimentation rather than mathematics. I think that this is one of those questions.

Yes it is the one question...
and i want to learn how you can apply maths to this, no matter how simple or complicated it is.
will ask mathematics learning centre at cqu.
thankyou for the input, will keep you posted.

**awabbit6** · 1st October 2007, 10:24 PM

It can certainly be done - it's called mathematical modeling. There is software available to make this a more achiveable task such as Stella. I used this software once to model a falling parachute (not as easy as it sounds!).
It is very time consuming to set up. You need to identify the significant variables and then come up with a mathematical representation of those variables, then combine the lot! For your situation, there are many variables, but some can be eliminated/disregarded by assuming that they can be controlled. This is what Blknight was suggesting with his dyno experiment.

**Traveler** · 1st October 2007, 10:50 PM

Originally Posted by 001525

No need to get personal. My husband has never left my side since the day I met him. We're both deeply in love and we were pioneers in same sex marriages. You should give it a try before you knock it. I'm with RonMcGr. It's such a non significant question and topic. Traveler, you need to harden up.

No thanks. and thats nice you are with RonMcGr, i hope it all works out.
Perhaps it is not significant for you, do you speak for everyone on this forum?
I can only hear one b*tch, maybe you need to harden up.

RonMcGr · 2nd October 2007, 05:52 AM

Originally Posted by Traveler

First things first...
it would appear that you and others have a very small attention span, not unlike a little child. as well, you seem to think it is your right to hijack a thread with a temper tantrum because you cannot find a "point". very clearly i asked in the beginning, was their a way to work out which vehicle would use more fuel. instead i get woeful answers from i assume grown men who lack basic communication skills. you were not asked a question about your flying f***en falcon. and if the thread is to much for you to handle, what are you doing here?

I see, so you like to get personal when asked a pointed question!
In that case you are best ignored.

**Grimace** · 2nd October 2007, 06:33 AM

This thread sux

**cookiesa** · 2nd October 2007, 08:29 AM

Traveller you have asked a relevant question which at least a few of us are interested in. Ignore posts and don't reply to those who have nothing better to do than criticise. As said before perhaps those that are not contributing anything to this thread would be more comfortable with the same dribble day after day at 4wdmonthly.com.au/forum

**barryj** · 2nd October 2007, 09:04 AM

Originally Posted by cookiesa

Traveller you have asked a relevant question which at least a few of us are interested in. Ignore posts and don't reply to those who have nothing better to do than criticise. As said before perhaps those that are not contributing anything to this thread would be more comfortable with the same dribble day after day at 4wdmonthly.com.au/forum

OK then, you give the answer.

I hope you at least agree that the initial wording of the question left a lot to be desired.

**Grimace** · 2nd October 2007, 09:23 AM

Originally Posted by Traveler

How do you work this out...
2 identical 93 Disco's 3.5l
both travelling from point A to B at same time
one doing 2500rpm and arriving at B in 7 minutes
the other doing 2000 rpm and arriving in 10 minutes
car 1 has done 17500rpm using more fuel to maintain rpm but in less time
car 2 has done 20000rpm using less fuel to maintain rpm but taken longer time...
which vehicle uses more fuel?
are their any other considerations?

Wat gear are they in would be the main 'other consideration', assuming like you said, that both vehicles are exactly the same and in the exact same conditions.

Your question is basically impossible to answer in the real world, but in a simulated environment (like a computer game) it could be calculated mathematically using many variables and equations. BUT its not worth it.

Generall consensus would be if it was flat highway driving at a speed of less than 100km/h the vehicle doing the lesser revs/travelling abit slower would use less fuel.

Thats as far as I will get into this thread.

Thread: Fuel consumption

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