Since retiring in 2015 we purchased a new car for my wife, now over 7 years old with 56,000 miles. My new truck came along in 2018, soon to be 5 years old with 57,000 miles.
Other than the occasional road trip we each drive around 100 miles per week running around town. Hardly worth shopping for low gasoline prices.
Just returned from a trip, Colorado to Florida and return. Saw regular gasoline prices from about $2.59 to $3.69, diesel from $3.89 to $5.29 or so. Pretty significant differences noticed while crossing state borders, frequently 50 or 60 cents higher on one side than the other, which I attribute to differences in state fuel taxes.
No apparent effects on traffic volume. Highways are busy at all hours and city traffic is as crowded as ever.