I've been using 1 oz/5 gal gas and getting 24 mpg in tough rush hour traffic, lots of stop and go, more stop than go. I changed the dose to 2 oz/5 gal and the mileage improved 1.1 mpg on the last three tanks in 350+ miles per week commuting. Is anyone else using larger doese? Oh, and I use 2 oz/1k miles of LC.