Yes, but it'd be net-zero based on the carbon used to produce the fuel. In theory at least, in practice most synthetic methane has only been produced by scaveng

Yes, but it'd be net-zero based on the carbon used to produce the fuel. In theory at least, in practice most synthetic methane has only been produced by scavenging CO2 byproducts from the chemical industry. It's not truly net-zero rather it's releasing CO2 that would have been emitted anyway. CO2 is in too small concentrations in the atmosphere to effectively capture.