Obviously, the answers are to drive less and use a fuel-efficient car. But if you already have a gas-hog car, not everyone can afford to go buy a different one.
Dh is applying for full-time work in the fall, but we don't know where it will be. It could be as much as a two-hour drive. And we can't move; we just signed a one-year lease. So it's possible he will have to drive 400 miles a day.
Why will grocery prices go up? What does that have to do with gas? For grocery trips, if it's not raining and dh is home with the girls, I use a bike and a backpack. It works pretty well. It might mean two trips, if I'm getting a lot of things in large containers (like milk or detergent) but then I get good exercise too!