I wrote about Dow Chemical when I financed my Tesla and got a 5.5% APR for 84 months. At the end of 2018, they paid a 60% rebate on the interest so my effective APR that year was 2.2%. For 2019, it seems they paid out only 50%, so my APR was an effective 2.75%. Still not worth the hassle for me to refinance or pay it off yet, but I’ll have to consider it next year if they drop the rebate further.