Choosing between 2 used volts

So I'm the market for a volt and pricing wise used seems more in my budget.

Im looking at 2 used cars, and im having trouble deciding

2017 Volt LT - 56,000km - $28k

OR

2016 Volt Premier - 9,800km - $31k

So here's my biggest worry 9,800km for a 2016 doesn't make sense, maybe if its a dealer test drive car, but then my worry is that gas engine might have sat for months unused with stale gas. The 2017 has quite a bit of KMs on it.

Thoughts?

Thanks!