I have a little Lexus IS250. I think the reason I only have to fill up once a month is because I hardly drive now that I'm not hauling around kids. My work is within 5 miles, and I don't venture far beyond the neighborhood to shop, etc. Anywhere that we go that is far, my husband drives. (I'm like some granny, except I'm not in a Cadillac, and I look better in my car
)
I got the car November, 2008 and I have less than 7,000 miles on it!