korek! my ride is 5+yrs old na and my shifting pattern when driving in the city is to shift to the highest gear possible to save fuel, but when in a long distance driving , id try to achieve the highest speed possible namaN SA HIGHWAY, so minsan i'd rev up to 2500rpm to 3500rpm then shift up, for better pull and higher speed. down shifting naman depends on, kng when ur car jerks because your on high gear and the engine just cant turn the wheels properly or takes too long to achieve faster acceleration.