Holeecow

I would guess that top down with AC cranked would use the most gas... but on my last tank I drove about 50 KM in stop and go with top down and a/c and I still managed 470 before the light came on?

Anyone ever notice a big difference with any of these?

CR EH

Dunno..my S doesnt have A/C and its got a hard top

But i believe you would be correct with your assumptions, although i dont think you would lose too much with the top down?

Either way i think the way you drive your car will ultimatly decide how much gas you use.

starchland

Im actually kinda surprised with the fuel efficiency of this tiny automobile and I dont notice a huge difference while using the a/c. But I would say that top up a/c on uses less gas than top down no a/c.