Gas and petrol vs diesel

[alterastro]

Sorry to resurrect an old thread, but I've had my TB48 duel fuel for about six months now. I'm in the Uk and as far as I know it's the only TB48 in the country...

Thing is, it has been running fine, but on a full tank of gas (105lt tank, 80lt when full) i'm only getting 150 miles (240km) from it. Doesn't seem much better on petrol. Now it is lifted with winch and bumper etc but does it sound like there is something wrong? I just assumed, with nobody over here to compare it with, that's the best I could expect!

If something does sound wrong, where should I start looking?

Cheers

Nick

[threedogs]

Sounds right a big thirsty 4.8 would drink as much as my 350 Chev troopy.
I returned figures of about 150ks from a 90ltr tank until I installed a larger
120ltr tank, was still woefull

[mudnut]

Have a read of the small section dealing with running LPG on this thread.

http://www.nissanpatrol.com.au/forum...-Helpful-Hints

There are so many variable factors which can cause high fuel usage on a duel fuel engine. Getting it tuned by an expert may help.

[BigRAWesty]

The problem with most dual fuels is you cant tune 100% to both.. you have to compromise..
A mate of mine has a tb45 dual fuel and is going full petrol..
He only has the 40l petrol tank so has bugger all range..
His range will near double once we fit the 90L rear tank as he only has a 90L gas tank..

[mudnut]

Yes, Kallen, you have hit the nail on the head. If I had a duel fuel ever again, which I won't by choice, I would set it up as a dedicated gas system with large gas tanks. The big problem with that is if you do run out of gas you are stuffed.

[lucus30]

The problem with most dual fuels is you can tune 100% to both.. you have to compromise..
A mate of mine has a tb45 dual fuel and is going full petrol..
He only has the 40l petrol tank so has bugger all range..
His range will near double once we fit the 90L rear tank as he only has a 90L gas tank..

Just did mine. 2 new tanks a 75 litre and 145 litre
I hated the gas. I say gas is for bbqs not cars

[Bob]

Well Guys I have a 4.5 Dual Fuel and obtain the following

105 Useable Litres of Gas using 18 Litres per hundred which equates to 583 K's
35 Litres ULP using 16 Litres per hundred K's 218 K's
Total of approx. 800 K's (These figures are for Highway Cruising)

Gas is 50cents a Litre in Bendigo which costs $9 per 100 K's of Motoring on Gas so total cost to fill a Tank of 105 Litres is $52.50

Towing our Caravan Gas usage is 25 Litres per 100 K's equates to 420 K's

I had the Head Ported out to allow for better breathing which improved fuel consumption greatly
More than happy with Gas

[threedogs]

The problem with most dual fuels is you can tune 100% to both.. you have to compromise..
A mate of mine has a tb45 dual fuel and is going full petrol..
He only has the 40l petrol tank so has bugger all range..
His range will near double once we fit the 90L rear tank as he only has a 90L gas tank..

Should be able to fit a 120ltr tank in a Patrol YES???
its only 998mm between the chassis rails yes??
You really want sequential injection for a better burn and efficiency

[lucus30]

Well Guys I have a 4.5 Dual Fuel and obtain the following

105 Useable Litres of Gas using 18 Litres per hundred which equates to 583 K's
35 Litres ULP using 16 Litres per hundred K's 218 K's
Total of approx. 800 K's (These figures are for Highway Cruising)

Gas is 50cents a Litre in Bendigo which costs $9 per 100 K's of Motoring on Gas so total cost to fill a Tank of 105 Litres is $52.50

Towing our Caravan Gas usage is 25 Litres per 100 K's equates to 420 K's

I had the Head Ported out to allow for better breathing which improved fuel consumption greatly
More than happy with Gas

But what do you do in places you can't get gas? Also I've noticed heaps of servos are no longer supplying gas

[alterastro]

Thanks for your replies guys.

So if my math is correct I'm drinking 33litres per 100km (in uk money I'm doing 150 miles to a full tank of gas - 80litres) which judging by posts on here is way high!

In the Uk petrol is around the £1.08 per litre (au$2!), yes, really! You don't know how lucky you guys are! Gas is about half price so you can imagine I'd like to get as many miles as possible!

But where do I start?

Cheers

Nick