When biogases are directly used as fuels in SOFCs, catalytic reforming of methane into hydrogen and carbon monoxide occurs at the nickel anode. This may expose the anode to localized cooling and high risk of carbon deposition. These issues can be tackled by preprocessing the biogas. Diluting it with steam or CO2 recovered from the SOFC anode off-gas may suppress the risk of carbon deposition whereas reforming it externally can protect the cell from thermal instabilities while offering additional protection against contaminants. Ruthenium has an outstanding catalytic activity with demonstrated coking resistance. Its cost however limits its use. In this work, dry reforming of diluted biogases was performed on a low-ruthenium-exsolution catalyst. An approach by total material balance allowed to determine near 100 % methane conversion at GHSV up to 2000 h-1 while the reaction was close to the computed thermodynamic equilibrium.