This study shows the effects of different injection strategies for methane, hydrogen and hydrogen-enriched methane in a single-cylinder spark ignition engine. In port fuel injected engines, it is well known that hydrogen addition to methane leads to improved combustion stability due to accelerated chemical kinetics, especially at the flame kernel development phase and at higher excess air ratios. In this study premixed (i.e., port fuel injected) methane hydrogen blends, and split injection of methane (port injected) and comparably small amounts of hydrogen (direct injected) were compared. The split injection of methane alone (i.e., port injected and direct injected) was studied to distinguish between enhanced chemical reactions and flow effects. The direct injection was varied in terms of spatial direction, injection timing and the share of total fuel. The results show that late fuel injection towards the spark plug can produce a significant advantage due to increased turbulence or charge stratification. It is also shown that the extension of the lean limits by the direct injection of comparably small amounts of methane is very similar to the lean limit extension using hydrogen addition. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.