The 1999 Infiniti I30 is available as a 4-door, 5-seat sedan. Starting at $28,900, the 1999 Infiniti I30 Standard (A4) is powered by a 3.0L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 28-mpg on the highway. The top of the line 1999 Infiniti I30 Limited (A4), priced at $31,100, is powered by a 3.0L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 28-mpg on the highway.