Hey Ryan, sorry to hear about your experience. I really have nothing to offer as I have an Escape, but this forum seemed kinda lonely.

How's 18mpg compare to a regular Silverado? I can certainly attest to the fact that mpg improves over time as (a) the vehicle gets broken in and (b) you 'learn' how to drive it in the most economical way.

I wouldn't even try to disconnect the battery, the worst that can happen is that it'll discharge and you'll recharge it the first time you take it out again.

Colin