Honda Cars India Ltd. — performance of honda amaze

Address:

160036

I drive a honda amaze car, 2014 model. It is self driven and is almost single hand driven, primarily on the good roads of chandigarh.in its 3 years, it has done just around 22000 kms. I have been getting it serviced from harmony honda, industrial area 2, chandigarh only.
Previously it had been giving an average performance of 12.5 km per litre. But now, for the past 3 months, it has been performing very low (Data for 135 km attached).
But since the last service, it's performance has deteriorated. I have visited the service station twice post the service, and both the time they couldn't find any fault, but the performance remains the same. I have again contacted them and had been asked to visit again. I had unformed them of a planned visit to and scheduled for a visit post a planned trip to ludhiana to check on a long route too. However, didn't get an encouraging performance. (It is the last entry on the chart).
Chart attached.

Consumption

Liters mileage kms consu tot
29. 00 258.258.8.89.8.89
25.44.465. 207.8.14. 8.54
29.08.758. 293 10.07 9.07
20.70.923. 169.8.16. 8.86
31.12.1247. 324.10.41. 9.22

Kindly advise recourse.

Pradeep soi
420/37a, chandigarh
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