I have a 1998 Honda CRV and because of this site I have drastically improved its fuel economy. I used to get 250 miles on a full tank but on my last tank I got 322 miles with 2 gallons remaining in the tank when I filled up! Wow!
Because of this website I have done alot of things to my car.
1. My tires were at one time at 26psi (recommended Honda psi). But now they are at 40 psi. What a difference with the new tire pressure. The car coasts so much further. Very obvious feeling!
2. I changed the spark plugs, replaced differential fluid, replaced auto transmission fluid.
3. I took out my K&N filter. It has been in there since I bought the car. I dont know about the rest of u guys but I think the K&N made my FE worse! Of course I cannot prove that because I made all these changes to my car at the same time. I replaced the K&N with a brand new Honda air filter.
Alot of my driving habits have changed. And according to this message board is the most important change you can make. I live on a hill so one third of my driving involves going uphill. I dont race up the hill anymore like before. I have tried engine off coasting but it's a bit dangerous since the power brakes and power steering are turned off. I also noticed that if ur engine is off...the odometer doesnt increase. So I guess with this practice ur car will accumulate less miles on the odometer. I am trying to get to 400 miles on one full tank. But I think im really reaching...Another guy on another message board attained this but since I live on a hill this might be a little difficult. I coast in neutral every chance I get. I note upcoming red lights more often so that I coast to it. I bought a Scangauge 2 to monitor all of this also. Thank you gassavers.org!!!
When I EOC I only turn the key back one click (from "on" to accessory) and when the engine dies I go back to "on". That way you accumulate almost all of the miles you actually drive, and at least in my car I still have power steering. So yes, the key is in the second position, dash lights on, while I EOC.
I haven't really played with tire pressure yet, though your results make me exited to try, especially the part about longer coasting