Hydrogen abstraction reactions are key steps in free radical mechanisms that dominate the combustion and atmospheric chemistry of the alkane hydrocarbons and, as such, merit study for their relevance to current environmental concerns. The lower mass alkanes also provide important test cases for H-atom reaction rate theory for polyatomic systems. Due to its remarkably light muon mass, studies of Mu reactivity provide unique tests of quantum mass effects in rate theory. Results obtained for propane suggest a reaction rate that is much faster than anticipated, with a remarkably low activation energy. This has prompted our interest in measuring the temperature dependence of the Mu reactivity with butane.