If you were to get and learn to read a interior vacuum guage
you could pick up some mileage.
Probably one of the simplest/cheapest methods of saving gasoline.
X2My daughter had a 1991 BMW 318is (1.8L = 110 cu inch) with a fuel economy gauge (vacuum). We drove out to Las Vegas (270 miles) for one of her volleyball tournaments. I decided to make the first leg of the trip while keeping the needle in the economy range for as much as possible. I got 48 mpg! I was able to run at 70 - 75 mph on the flats. On the return trip, I drove how I would normally drive and managed to get 32 mpg.