I guess what I've read about fuel economy is outdated. My main point is that: we shouldn't drive faster than our vehicle's limit of optimal fuel economy, since

I guess what I've read about fuel economy is outdated. My main point is that: we shouldn't drive faster than our vehicle's limit of optimal fuel economy, since after that point fuel economy drops sharply. All that said, I don't know what to say about driving 3-4 hours a day. After working 8-10 hours, and driving for 3-4 hours, there's not a lot day left before you have to start all over. Driving a total of 150 miles for groceries blows my mind; that's basically the width of the top half of Louisiana.