Zub,
You don't need all the equip and installation you have been reading about to benefit. If you can collect WVO,wash it, dry it and filter it you can "mix" it in with D and benefit hugely. If you blend at 50% your fuel cost goes to half price. In the heat of the summer, now. No tanks, heaters pumps or fuel lines.....blending is the poor mans Waste Veggie Oil system. Wash it and dry it with a bubbler running in salt brine and then let it sit for

? Filter and test it using the "hot plate" method. Store it in 5 gal totes with a shot of bactericide fuel additive and it keeps for a year. Fill your first tank on 50% and lug along as many totes as you care to for the trip. Hope to see you in Orygun next summer.....right?
Your drain oil is a know commodity to you. If you aren't cleaning and drying that and diluting your fuel no more than 10% with it then shame on you. I can't testify to this but long ago I was told that back in the day DD used to include the statement in their documentation that using "more than" 10% motor oil in the fuel would void the engine warranty. So 10% was SAFE as far as DD was concerned? The problem was feeding the fuel pump high viscosity fuel.....not that oil would foul the engine. Not if it is clean, dry and neutralized.
Doing both gets you down of 40% of the cost of a gallon of Dino D. Are we talking a long distance drive for summer or just more trips?
Find a site called "journey to forever" and get comfy cause it will take you a good long while to finish blissing out if you liked this post. Log onto Blenders(they are certifiable so be careful there) and the other sites on Yahoo Groups that deal with WVO and BioD using and making.
Ever hear of a guy pulling into a service station and getting a load of pump gas by mistake? Sure you have. Well the cure if that happens in the summer is to dilute that amt of pump gas with 80% clean WVO. In the winterdilute it with 50% WVO. Probem.....ALL GONE and you get to use the gas you were refunded and the cash for dropping the tank and cleaning it and replacing the DinoD that was in the tank. you know....when life deals you lemons you make blender fuel and keep on trucking. Make a big stink at the station though and "mums the word"....right?
HTH,
John