What time of the year and what day of the week will you be making that drive? I've just come from three nights spent in Balatonfured, which I used as a base for visiting a bunch of towns on and near the lake. I intentionally chose to avoid the weekend, arriving late afternoon on Sunday. The area was pretty dead. I had a good meal Sunday night but wasn't about to return to that restaurant, which had unilaterally imposed dynamic currency conversion on me and didn't resolve the problem quickly.
After excluding that spot, I couldn't find a decent restaurant open in Balatonfured on either Monday or Tuesday night. I didn't look for food in Tihany.
Unless your visit falls during mid-summer or on a good-weather weekend, I'd suggest some internet research ahead of time to identify a few possibilities that are expected to be open. The food in Hungary is too good to settle for food-as-fuel.