Please advice:  i10 Magna with 30,000 on the odometer (2012 make), no accident for 2.5 lakh or Wagon R, LXI, run for 51,000 kms, 2008 make for 1.9 lakh (true value price). Both are petrols and I plan to have CNG installed, as I drive around 2,000 to 2,500 kms per month. Which will be a better choice? Thanks