Can I do a land run to Savannakhet for a 60-day visa with a new passport as a US citizen?

A US citizen can indeed perform a land border run to Savannakhet for a 60-day visa. However, it's important to note that while there are no formal restrictions for tourist visas, some embassies or consulates may limit the issuance to one visa per year. Additionally, travelers are allowed up to two visa exemptions per calendar year when entering by land, and up to six by air. Having a new passport does not guarantee a clean slate, as immigration authorities can access past travel histories, though they may not always check.