Start with what the Lexus IS F is: a car with gasoline engine, from Lexus. What it meant takes a little longer.
What is underneath
The engine is gasoline engine. On the scales it comes to 1717 kg. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Its place in the line
Nearby in the Lexus catalogue sit the Lexus ES (V20) and the Lexus GS 450h.
Owning one today
Buying one now means $17,700–$32,600 for a typical example, and running it — fuel and maintenance at its age — costs about $5,851–$7,869 a year. Insurance sits around $1,860–$3,130 a year. The figures are class-level estimates from the federal record, with the formula on the methodology page; the model-year pages carry complaints, recalls and repair costs year by year.
Lexus1989
Lexus IS
Lexus IS (XE20)
Lexus IS (XE30)