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Hi all, I've got a 1996 4.6 P38, done about 180k kms.

Well maintained, new plugs and leads. Has a good LPG system, (not injection), never had any backfires.
It goes well enough on both fuels, but dies in the bum up hills.

I tow a Jayco camper trailer, (just over 1 tonne), and boy can it chew some fuel when its towing that, 25 - 30 l/100.
Verrrryyy slow up hills when towing.

My thoughts are worn camshaft, blocked exhaust, or just crap for towing.

How restictive is the exhaust?
 

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I noticed a considerable increase in milage (decrease in consumption for some...) when i replaced my center box with a Dynomax Ultraflow, and had the rear resonator replaced with straight pipe. May help. A good tune up never hurts.
 

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:think: You have hills in Australia?

I have only towed things a few times with my P38, but it has never been sluggish or slow in the process.
 

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Don't forget your lpg venturi will restrict airflow into the engine, probably more than the effect of the exhaust. I have cars and RR's with both systems and the difference is noticeable.
 
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