Jumbojet Bhai, that Adam Motors van design by you is looking really nice.
Cheetah bhai, you concerns are valid. But what are the alternatives you are considering, in that price range. Mehran is the only other option you would have open, or used cars which have already put 10+Years on the body and engine. So, only REAL options are either a slightly used Mehran since new one will cost 310,000 PLUS OWN, or a BRAND NEW REVO, which you can drive home for 286,000 Taxes, registration included.
About the pick of the car. Its true that Revo is slightly heavier than mehran due to added safety features and a bigger body but not too much heavier. I think anumalik who has owned Revo has said it gave him good fuel economy on CNG. It all depends on how you drive. If you accelerate the cars, too much while initially moving the car, then obviously car will consume more petrol of CNG. but if you just drive easy, and don't press the accelerator too hard, the CNG consumption would be good, plus it also depend on where you drive. Inside the city, it will always take more CNG.
About parts. Revo uses almost all the same local parts, as Mehran does. Both Revo and Mehran have 70% local parts. So, whatever you can buy for mehran, like shocks, brakes, other local made parts should be able to fit into Revo. The main difference is the engine, which both get from abroad. So, Maintaining REVO will not cost you more than maintain Mehran. But infact it may even be more cost efficient, due to being a new car, and more attention given to quality. Alot of new Mehran owners complain of noises comming from Shocks, struts, brakes being too loose, etc. but in Revo no owner has mentioned such thing.
Engine on this car is also trust worthy, as GM of USA is using engines from same company WULING, in China for their cars being made in China.
So, Go for Revo Brother. There are more reason to go for Revo, then choosing Mehran. By buying REVO you can not get a car inferior than a Suzuki Mehran. Suzuki people don't care about quality, they know they can sell it and people have no choice, BUT NOW, its different, now YOU have a better choice than Mehran.. Then why go back to a company, like Suzuki, which does not care about its customer and keep selling them same Substandard, low quality car like mehran for almost 17 Years now.
Think about it. Revo is better choice.