Question about buying Carter BBD for my 318 (unless I should look at something else)

It sounds like the Monaco isn’t and won’t be a daily driver. If that’s the case, you shouldn‘t be using fuel economy payback as the justification for the replacement.

The payback for anything on a fair weather driver isn’t measured in $ savings but such things as enjoyment, pride and accomplishment.

Its reasonable to think the insurance cost you pay for it annually is pretty steep relative to the miles you drive it each year?