let me tell u my driving style when i want to get maximum mileage i.e. 12 to 13km / liter from my car inside city n 16km/ liter on highway
for highway
1st gear only used to just give it a push n don`t rev hard at all
2nd gear 10km to max 25-30km
3rd gear 30km to 40-50kmnmax
4th gear 50km to max 70km
5th gear 70km upto 90-100kmh dis my style on highway
in city first 2 gears same
3rd gear 30km to 40km
4th gear 40km to 50km
5th gear 50 km to max 70km