TBS Vehicle Maintenance 

Tracks scheduled and completed maintenance work (based on miles, kilometers, or hours), fuel usage (in either gallons or liters), operating costs for maintenance, fuel, and oil costs.
vehicle maintenance auto maintenance tires operating costs

CNG 

CNG-CALC is an economic analysis system for alternate fuel vehicles.  Compare the cost of any alternate fuel scenario, for any type of vehicle.  Use to produce financial comparisons (cost/savings) for CNG/Methanol/Ethanol/Gas/LNG/Diesel/Elec/Propane.
alternate fuel cng gasoline lng hydrogen methanol ethanol diesel propane electricity convert financial analysis