"eHelmholtz"...the second car can be a true gas guzzler or a small roadster, depending on needs and tastes.
I have a 96 Cherokee (16 mpg average) and a 82 Fiat Spider (25 mpg average), registered and insured (about $500 for the last year, between the two of them).
I only have put about 100 miles on the Fiat, and 50 miles on the Jeep, since I got my LEAF, 10 months and 7,300 BEV miles ago.
I am quite sure I will put some miles on both ICEVs very soon, though.
Both are Due for Their biannual smog inspections, within a month.
$100, for gas for the trip and inspection fees, and two hours of waiting, between them.
In my recent experience, ICEVs, are quite expensive to operate, in terms of cost per mile...