Hey Dave;
I thought the regs (VSB 14) says that you only use the weight of the sedan and multiply that x 4 (vehicles between 800 and 1100kgs) for an normaly aspirated engine.
Dave section LA of VSB 14 refers
Regards
Neil H
Yes You are correct section LA1 VSB 14 says to use the weight of the sedan with the formula you have stated but if you read the paragraph above the table page 11 of section LA engine guide it says that LA 1 does not apply to commercial (ADR NA or NB) NA is commercial vehicles with a gross combined mass not exceeding 3.5 kgs, it goes on about four wheel drives etc and concludes with for which there are no set recommended limits.
I have always understood that a utility classed as a commercial vehicle so it may be feasible. I will continue the research.
Cheers Dave