I totally think this depends on the situation, influencing factors, and people associated. I am currently drinking just as much as I had on the road, while homebuming it. Soooo. Ya, as others have stated, my answer is "yes"
I drink more on the road.
1. Because a lot of other travellers I hang with like to drink.
2. Because after a day of making fuck tons of miles, (most days) I deserve a beer.
3. It's easier to interact with many strangers while spange/busking when intoxicated. Plus, it loosens loosens up my wrists- so I can play washboard better.
I still want to drink every day.. But, being in one place for extended amounts of time makes it easier to save money, and refrain from buying alcohol.