It has been suggested that some agricultural carbon (C) mitigation options will yield no net C benefit under full carbon accounting (i.e. when costs are included alongside benefits). The largest likely C cost of implementing many options is the fuel cost associated with transporting resources from the place where they are produced to the place where they are used. In this article, we show that fuel C costs of transporting resources are much lower than the C benefits of agricultural mitigation options. These findings suggest that the agricultural C mitigation options examined here will yield a net C benefit, even under full carbon accounting.