Minecraft wiki entry for Minecart, associated text: This table shows the distance traveled by an unoccupied minecart on a downward slope, with a boost (or no boost). The most efficient way is to use only 1 boost at the bottom of the incline on the flat surface. Using 2 increases distance by about 20% or 1.5 blocks. All distance trends based on the height seem to be logarithmic. The carts started from rest, on a slope Height blocks up.