Gas is defo the best cooling/freezing method in our fridge. When I arrive on site, I tend to start off on gas for the first 4-5hrs or so, then go onto mains. I have tried running on 230v first and gas first, but find hands down the gas cools the fridge down the best. I tend to put it on gas when we arrive around lunch time, then when we have tea, I flick it onto 230v. Works really well for me