I also have a Sentra GS a/t. Normal driving from Caina to my office at Ortigas takes me 45 mins to one hour ang consumption is now averaging at 7k/li. Noong bakasyon my travel time is 30 minutes to 45 minutes, I can get 7.5 - 8k/li. For hi-way driving, I normally to go to our plant in San Fernando Pampanga and I can get 11 - 12k/li. driving at 100kph (average).