Congrats! Last time I checked I was pushing over 80K on a two tank system with a flat plate heater and redudant in line filters. I too start on Diesel and once warmed up switch to WVO. Then back to Diesel about 5 mins before I shut it down. I keep a record of how much WVO I have burned and what I saved in fuel costs. So far I have saved about $9000 in fuel cost on a car I paid $3000 for and have probably put $1500 in repairs and WVO equipment over the years

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2012 Mercedes ML350 Bluetec 91K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 231K (mine)
1998 Volvo S70 T5 Turbo 196K (kids)
1994 Ford F150 4WD 249K (firewood hauler)
1983 Mercedes 300D 376K (diesel commuter)