nah, its all legit. Last year i spent 120+ days out of town, so i can claim living away allowance (company pays me 45 but i can claim way more), same with car km, plus car maintenance (yes i needed a heavy duty clutch, timing belt change, new brakes etc..) and even comprehensive insurance.
Cos my wages were so random there were weeks where i'd get owned by the taxman, now its payback time biatch!!