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Converting 2006 Yaris to LPG (dual fuel)

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So I have a 2006 Yaris 1.5L Manual and I do around 600k-800ks a week. A lot of driving as I travel to work and back (2 jobs) and uni + travelling. 

I am getting an average of 15.65 kms per L from my mix of stop start/highway (80-90kmph) driving. It is mostly highway driving

I would like to have an extra fuel tank in the car as LPG in Victoria right now is 44% the price of petrol . LPG goes for 74 cents in some servos and ULP is around $1.60-1.67

I don't know if LPG tank in the boot will affect the fuel efficiency in any way. Last month I travelled over 600kms in a long trip with 2 passengers (one passenger 67kg other 59kg) and still got 15 KMPL on a long trip.

I'm planning to keep the car for a few years so is this a good decision considering i will be travelling a lot of ks in this car ? Do people install LPG systems in 4 cyl cars? Is it worth it without the gov rebates? 



Edited by zeezbrah

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