Just so you know...all 'overtime' in the Armed Forces is, unpaid.
In some places, a vehicle is a neccessity, most SUV/Chelsea Tractors, could be replaced with a secondhand MINI.
I spent 10 years commuting to London and back, 200 miles a day, 06:00-20:00, then I had an epiphany !
I worked out that, if I ditched the job with a good salary, factored in London prices for food and, entertainment whilst up there (Lunches aren't free), forget the company car (only needed for the commute), I could exist quite comfortably on a lower paid job, 8 hour day, 5 minute 'commute', not forgetting an infinitely happier life style with more home time.
Anybody can do it, all it takes a bit of reflection on what you want from life !