I didn't put this in the software section because that section looks anemic.
The program I'm writing does gas/drive/speed logging so I can monitor my mpg and cost. It tells me how many miles ive driven since my last fill up, average and peak speed. This generally works fine as it pertains to actually driving. However when I'm not driving, or stop and go traffic at less than 2mph, nothing is registered (I have it programmed to only calculate/register when I'm >3mph). I know it is a pretty broad question considering different cars and mpg and such, but how can I go about calculating gas use while the car is at stand still(stop and go traffic)? As it is, I generally get 14-18mpg city.