Both my RV and car are due for emissions tests

[Mike]

If you mean fuel stabilizer, you can get it at Canadian Tire. Many folks on here who store their RVs over the winter
suggest adding it to a full tank before you bed down for the winter. It's supposed to stop the varnish problem.
I got some and tried adding it, then I found that I wanted to take the rig out for a drive every couple of weeks
to exercise the drive train. I assume the stuff helps anyway, and doesn't seem to affect the performance when I do
drive the RV.