I've had my 2010 Insight for about a month. Got it at a dealersip. I have filled it up 3 times. Fill up #1 was 39.9 mpg but the dash display for the tank said 42.3. Fill up #2 39.9 dash display 42.3 #3 39.9 display read 42.3 Consistently 2.5 too high. Is there a way to calibrate the dash display to be correct or is the a deceitful tactic to make it look like you are getting more mpg than you are actually getting. I am disappointed the the mpg is the same as I got on my 2003 civic I traded in for the Insight. Does anyone have a ballpark mpg increase % from winter vs summer.. I am hoping cold weather is the reason for the lower than epa rating fuel economy and that warmer temps will significantly increase the mpg's. the reason I got it is because some posted close to 50 mpg's. I did a lot of research to confirm that. I have tire pressure at 41 psi and "granny" drive. Any thoughts or ideas are appreciated. Car has 30,000 miles on it.