Diesel LPG fuel consumption report

Hi ya all.
I recently up graded my 1998 s/c 4wd to Diesel LPG mixin, here is my fuel consumption report.
all my report will be km/L(you do the math if you use L/100km, it is so hopeless)

Without LPG
Shell diesel 9.1km/l
BP 9.8km/l
Caltex 10.5/l
Moble 9.5km/l
Toal km since topping up / Diesel used

With LPG
Caltex 12.4km/l Toal km since topping up / {Total fuel cost(Diesel+LPG)/Diesel Cost}


I did most of installation coz few work shops in Sydney charges over $5000 for it, I saved almost half of it.

For information:

9.1Km/L = 10.989010989L/100Km

9.8Km/L = 10.204081633L/100Km

10.5Km/L = 9.523809524L/100Km

9.5Km/L = 10.526315789L/100Km

And

12.4Km/L = 8.064516129L/100Km

I suppose that the most relevant question is:
Is a saving (In the worst case) of 1.5L of diesel per 100Km travelled really worth an outlay of AU$5000.00 (Or $2500.00 in your case) really worth it?

You'll save 1 tank of diesel fuel for every 7142Km's travelled. (more or less)
(And burn several tanks of LPG!)
Personally, I don't think it is worth the effort but that's just my opinion.

(As an aside, my LH125 Campervan used to get 9.5L/100Km around town and 9L/100 on a trip on it's old, tired, rattling engine!, the new engine does 8.5L/100Km consistently and it's not even 1000Km old yet!)

91 SC 2,4 /2wd
Recently installed (HHO) hydrogen on demand system. had limited highway driving so only one test available.
8.8 km per liter system on
6.2 km per liter on straight diesel
identical distance and the same pump filled to 1" to the neck all foam gone in both instances
You do the math.
I am particularly interested in lowering the emission and that i know I am achieving