I've just started using a few techniques to increase the fuel efficiency of my 2012 Honda Civic, now hybrid model. I have been shifting into neutral with my automatic transmission and letting it idle in neutral at red lights, in economy mode I was averaging about 36 miles per gallon for my daily driving which is a mix of highway and city driving. This tank is closer to 37.5 to 38 miles per gallon. I think that's a pretty good increase. Any other techniques that you use while driving your daily driver?