My new XL6 against my old SX4 - generation gap!

I took delivery of my XL6 in late August, and till date, I have covered 2000+ kms in 3 months with a mileage of >16 kmpl. I have upsized the tyres to Bridgestone Turanza 195/65 on the same R15 alloys (Nexa threatened to invalidate the warranty if I replaced those R15 wheels with R16, even if the R16 are from Nexa), which has added well to the already smooth ride with even less road noise. Overall, except for the lack of airbag protection for the middle row (and remember it's this row in XL6 which is being differentiated as USP for XL6 against it's sibling Ertiga) and some other small creature comforts like auto-dimming rear-view mirror, I am very happy with XL6. This is a 100% family car, so do not expect much driving thrills. My other car is 2011-make SX4 that has covered 100,000 kms till date. Driving the old SX4 is still much more fun with it's larger 1.6L engine and bigger R16 alloys. However, the XL6 beats SX4 hands down on mileage (>16 kmpl against <12 kmpl) each and every time. By the way, although I purchased the XL6 from NEXA (Vipul Sec-63 in Noida), the buying experience was still same as any other Maruti outlet. The only difference were the grey suites worn by sales staff, and coffee in a china cup. I had heard much about NEXA experience, but in the end it turned out damp squib.