Here's the link:
The website is in Chinese but you can try to open it using Google Chrome and it should translate the page by default.
I spoke to the brain behind this Chinese version. This was developed by a Professor in Tianjin University as a commercial product and according to him; it's Euro III compliant. And it will cut emissions and increase fuel economy compared to carburetors.
Having no experience or understanding of either of these systems, I'd compare them like this, a Chinese carb would last atleast 5 years (according to yourself) and this Chinese EFI... we don't know for sure. So, let's just assume for a moment that it's not really a good quality product, say it would last no more than 2 years; I still think it should be commercially viable esp. if the Sazgar example you've quoted is true - extra 15km to the liter is a lot. Let's extrapolate the numbers to understand what they mean, if a person drives the Sazgar rickshaw for 10,000kms in a year, he pays for 400 Ltrs (at 25kms/ltr mileage) of fuel costing him 30,000Pkr (Assuming Fuel costs: 75/ltr). Now upon installation of EFI system, if he was able to get 40 Kms/ltr this would mean he requires 250 Ltrs of fuel costing him 18,750 Pkr. That's a difference of over 21K in one year alone. If the product lasts for two years; we're looking at almost 45,000Pkr. That's roughly about the price of the original product by Ecotrons. So basically, in one year, in terms of returns this EFI has saved more money than initially invested proving that it should be feasible to change this system every year (if required) and still spare some change while protecting the environment. It also means that in two years, a person would be able to save enough to upgrade to the original product. haha.
On a more serious note, I don't think the product could be a low grade one. Because it has been properly developed in the labs of Tianjin University and then industrialized in Hangzhou, Zhejiang province. Let's not mistake this for one of those backyard made/cottage industry products that are infamous for their ability to last no more than a day.
You've made a very interesting point about minute increases in mileage for smaller engines, I have no idea and I would love to find out. There are just too many assumptions in our hypothesis above. But I guess there is no other way to find out than giving it a try... ?! fingers crossed
Please correct me if I'm wrong here, Sazgar has a 250cc engine, yes? If we assume that a smaller 150cc engine would offer less of an improvement, how much of a difference would you say there would be? I think if there's an improvement of an additional 10Km/ltr, this should become an interesting proposition. I'm beginning to like this idea.