[westb87]

Originally Posted by mpg_numbers_guy

That's good...how easy is it to install? I know that's kinda relative but...

Is it possible to work the other way and have the O2 sensor failing in that it runs leaner instead of richer?



Well that route last night is known to get really bad mpgs (I never got above 30 before hypermiling) and I usually get in the 30s (I did get 45 once) but 29.4 is just terrible.

O2 sensor isn't dead yet; I managed 48.5 mpg for the first half of my driving today.

And yes my car does the same thing - one moment I'm cruising at 55 mpg and the next it jumps to 65 mpg without any change in elevation or anything. There's one stretch where I can average 70 mpg for about half a mile on completely flat terrain both ways.



If only though lol.

That sounds complicated. I might consider that but for the most part I'm happy with the MPGs...except for those occasional bad trips...but 29.4 last night lol...I could go 80-85 mph and get that.

I drive my Civic about 25 miles daily so taking off the road for longer than a few hours isn't really practical.

I thought about it and I'm still considering my SG2 to be lying to me until I calibrate again. I'm at 290 miles on this tank and I've used just the first tick-mark past a half tank of fuel. If that's about 6 gallons, I'm at 48mpg right now. Won't know for sure until I fill up, but I'm hoping! I ran a bottle of Redline SI-1 into this tank before filling up, so I'm wondering if it helped to "clean" combustion chamber/valve/injector deposits which are helping to free up some extra MPGs. Have you run any fuel system cleaner through your Civic since you've gotten it?