If this fewer miles than needed to repay the cost of conversion via fuel cost savings you MAY want to reconsider converting it at all. 2. WVO fuel is not FREE. There is a cost associated with gathering it and processing it to fuel quality. These can be broken down into the following:a) WVO collection containers. These may be as simple as some 55 gallon drums with tops. But most add a chain and lock (to prevent theft of the entire drum) and a locking lid (to prevent theft of the wvo). Each WVO source will need at least one drum. Approximate cost per drum w/locks/chain/lid $40-$70 each. And you may need more than one or two. Note:If you are really cheap and don't expect to use much WVO each year you may be able to talk your sources into pouring the wvo back into the cubees it came in originally or lidded buckets. This will be much cheaper..but involve more labor and is not really practical for most who use over 100 gallons of fuel per week.b) A wvo collection device.In warm/mild climates this may just be a WVO vacuum (sucker) costing from $30 (if you use salvaged materials) to $250 (if you do not). In colder climates you may need a small trailer and hydraulic swing crane so you can load full drums of solid wvo and transport them to a warm shop/garage to liquefy during winter months. This will cost from $300 to $500 depending on the size of trailer you need.c) A wvo processing unit.No matter how you collect wvo you need to remove the particulate and water borne contaminants before it can safely be used as fuel. The cost of a simple DIY processing unit is around $140. More expensive ones capable of processing up to 500 gallons per week are available for from $300 to $700...and up.d)Fuel and energy costs.Collecting and processing wvo into safe to use fuel takes energy...and you can figure this will run from 3 to 15 cents per gallon depending on the distance you must travel to collect WVO ..and the cost of energy used for processing.e)Due to increasing demand for WVO as feedstock (mainly bio diesel plants) you may have to PAY for it. This can run from $.10 to as much as $.50 per gallon. If this is the case simply deduct this cost per gallon from the "SG" amount in the above calculation to get a more accurate basic ROI number.There are more hidden costs associated with using wvo fuel including...3. Taxes. Most states frown on not paying taxes on ANY fuel used on the road. A few allow exemptions..but not many. The federal govt (IRS) has not shown much interest yet in collecting taxes..but it will eventually...and have the power to tax it retroactively. To be safe figure in your states fuel tax...and the federal tax on fuel to your costs per gallon. Link to a US map of diesel fuel tax. Again this amount should be deducted from the "SG" amount in the above calculation to get a more accurate basic ROI number. If you decide to not pay fuel tax on the wvo you use you may never get caught. But if you do you will be required to pay the amount you owe PLUS a fine. Your choice but it is not accurate to include the tax not paid for fuel in ROI calculations.4. Increased maintenance costs. This is actually a small cost but it should be noted anyway. Generally speaking it is best to change crankcase oil more often when using VO fuel. The more worn an engine the more frequently it will need to have its lube oil and filter changed. And it is also wise to change your VO fuel filter every other time you change your oil filter. On newer engines this is not much of an additional cost. But on older worn engines it may be. And consider the cost of replacement VO filter elements when choosing a kit. Some cost $6 and some cost $30. Generally speaking The cost of extra oil changes and filters will will cost $.01 to $.02 per mile so this amount should be deducted from the "SG" amount in the above calculation to get a more accurate basic ROI number.
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