I am about to put in my 2nd tank of gas. My first tank, which was filled by the dealership, got me almost 500 miles on 9.75 gallons of gas. I am down to my last bar and I am only at about 410 miles. My driving hasn't changed. When I filled up the first time, I didn't "force it." Any suggestions? Should I push it on the fill up a little bit? With 1 bar left, about how many gallons such it take?