Hey, sometimes it can be discouraging. I encourage you stay with it and keep trying, you are certainly on the right track. I see you're from Toronto,.so I'm sure you've been getting this cold (-15 to -20*C) weather too, and just the general cold temps from winter. Temperature has a huge effect of fuel economy, so since you joined in May, and your MPG has stayed the same, you have probably improved about the same amount as the weather is bringing you down. I remember seeing Diesel dave post something like every 1 degree Celcius equals about 1% in fuel efficiency. Starting from may in 20*C weather, to today in -10*C, if your mileage has stayed the same, thats about 30%
loss in MPG give or take, and your improvements have almost completely cancelled that out!
I have the same thing with my car right now, my mileage is slightly dropping even though I am trying harder and harder to get the best fuel economy, however as soon as the temperatures start to warm up and we lose this snow, I'm confident that my fuel log will show my efforts to improve my driving.
I encourage you to stick with it, keep going until the temperatures climb again. If you're fuel economy doesn't improve by the summer, let's come back to this.
