I like to change my hoses and belts every three years.....I do alot of traveling and have experienced a "popped" hose when it wasn't so convienent .....same with my work truck....a little prevention saves a lot of my time and money down the road.
R.I. area......$2.89-$2.99 for 87......prices change rapidly between the stations!! My work truck....98 ram 4x4...$75.00 to fill. Last about four days. :o