well i dumped in two bottles of fuel injection cleaner into half a tank of gas, Wynn's i think, and nothing happened but now that its been a few weeks later the gauge seems to be responding faster. at first it would take about 1 to 2 minutes before it would register full, this morning it only took about 10 seconds. i will see later on this week if the trend continues. i drive about 70 miles to and from each day so i get to try this often