Up to 600 km in a full tank? Can you verify that?
I have a Civic VTi Oriel A/T with a swapped JDM D15B. My car does 280-300 km in a full tank (with AC). Who did you go to here in Karachi? I would very much like to have my car checked. Ppl report up to 11km/liter averages whereas the most i've gotten is around 8 kpl. However, the engine is very quite on idle (you can barely know its on if no lights/ac is on), and the engine can generate a heck load of power as it very fast in reaching a 100-120.
JDM D15B VTEC (converted to single vtec from dual)
Stock A/T that came with the car
Stock ECU (Havent gotten down to checking its code)
No CNG (but previous owner had it installed).
1. Heavy lag on 1 & 2 gear.
2. Tranny is rather jerky on first 2 gears.
3. High consumption.
4. Car becomes very heavy with the AC on.
5. Accelerator becomes very stiff at 100 kmph.
6. Headlights may be a little dim.
Among a possible tranny problem, a mechanic told me it could be a wiring issue. I dont trust regular mechs as they seem to mess things up with their "jugaaru" attitude.