hi angelus,
i have an auto as well which makes it difficult to get the gains you will see people with manuals are getting.
if you want ideas on what you can do there is the wiki also if you look at my cars profile bugler, i have listed what my modifications are. They are all very cheap, i dont think i have spent more than 50 dollars on all of the mods however i have "borrowed" parts from work occasionally.
A quick and easy modification you may not have considered or you may have considered and dismissed is shifting into neutral and do pulse and glide. you mention you coast down to lights but do you do it in neutral. I found at least with my car that coasting in neutral to lights and doing general pulse and glide i got a large improvement maybe 12% (number plucked out of the air)
also turning your idle down is an easy change and gives some small gains which are increased if you go into neutral when going toward lights.
it may not have crossed your mind but you might be able to sell your car, get a manual that starts off with high MPG. You might break even doing that depending on what car you have.
well good luck
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