i may die doing it since the flow of traffic on the interstate to work is at least 70, but i've set the cruise control to 55; I got 3 extra MPG last week = which equals 10 gallons of gas a month.
I stayed at girl scouts last night instead of running home. saves a 1/2 gallon of gas.
doing "big" grocery shopping. our store does gas savings with a local gas station, but ONLY if you buy $50 groceries in a single purchase. your small purchases are not cumulative toward the $50 needed per dime off your gas. when our subtotal was $96 once, dh ran into the aisle and grabbed 4 loaves of bread to bump our sale over $100 to get that second dime off. we also make sure when we use the $ off to get the max (20 gallons) so we get the max savings.
The best we ever did was due to some accounting snafu at the store when they just started this, that gave us $1.70 off per gallon!