Here is a handy article regarding the alcohol content and calorie count of various beers: BEER GUIDE.
When selecting a beer to chug out of a Drankgon, we recommend lighter beers. From this chart, it appears that the lightest beer available is Bud Select 55 at 2.4%, which also has the lowest calorie count.
We have tried to Drankgon IPA's and it's not pretty, unless it's Pliny the Elder. That shit is delicious.