Vietnam is considerably cheaper than Latin America imo. I have family here so my experience is quite a bit different than the typical tourist. If you travel to the touristy places you may get a gringo tax but I don't think it's enough to be bothered about. A bowl of Pho costs about $1 here so you may get charged a $1.25. India seemed worse to me in this regard but it still wasn't enough to be bothered about.
I'm usually with my wife when I go to the touristy places so we pay as close as you can pay to local prices, she is an American afterall. When I'm on my own I'm usually in off the beaten track places and the people have always treated me fairly and are quite generous.
I'm staying in our house in Vinh Long now and like it here. There's not a lot of tourism here and those who do come stay on the river for the most part. I'm quite the novelty riding around town on my bike.