V8 Supercars will run on environmentally-friendly ethanol next year and the 2009 championship will be shortened by a month.
V8 Supercars chairman Tony Cochrane has confirmed cars in the championship would use 85% ethanol-blended petrol from next year, hoping to take the lead in promoting the greener fuel's benefits to Australian motorists.
The length of next year's championship will be shortened to 38 weeks from 42, with all 14 rounds and the Australian Grand Prix exhibition event shoehorned into a calendar with less breaks.
A final decision on whether a Sydney street race around the Olympic precinct will happen in 2009 is expected later this week while V8 bosses are considering a night race.
A final decision on format changes for next year, including scrapping the compulsory pit stop window and revamping the three-race sprint format, will be made by September.