Went to my native last weekend and back on same day, a sedate driving helped me getting 27.4 km/l for 740 KM, started at 7:10 am from Chennai (Saligramam) and back home at 11:30 pm. Similar kind of drive last time gave me around 25.7 km/l and the difference with last time is Tyre (earlier I was using JK and now it is Michelin) and using shell diesel compared to BP earlier. I started using Shell for the last three months and could see the difference in mileage. Anyone experienced a mileage difference using Shell fuel? Is it advisable to use Shell engine oil Helix compared to Selenia?