First of all, this was completely unscientific, was only 1/4 tank, the engine/trans were already fully warmed up at the beginning of the run, I was running the torque (pro) app, which had not been fine tuned to the car (just basic set up) and it was my wife's car.
When we take trips, we always (always) get 32 mpg, which is exactly what the epa rates her car at for highway, 22/26/32, 2010 Camry 4cyl, 6AT.
So, for my mod...I kicked my shoes off and was in no rush to get home from vacation.
I drove from southern Indiana to northern Indiana on hilly, 2 lane roads. I focused on DWL, timing traffic, and in-gear coasting up to lights and into little towns. My speed ranged from 50-60mph on the open road, down to 45mph on some of the bigger hills, and slower in towns. We had 2 miles of gravel roads and a little stopping for road construction (never shut off). Acceleration was light and under 2000rpm, I was amazed how easily I could hit 90+% load in her car at low rpm's, this transmission loves to up-shift and hold gears!.
I ran the A/C when coasting and when pointed downhill...and when the wife got too warm. It was 86 degrees today, but the tint helps a lot. The car is bone stock, including tire pressures.
So, my convoluted, unscientific results were....40.12mpg, a gain of 25.375%!!!
I feel like an ecomodder! I never thought I could break 40mpg in this car, especially with the AT and the hills on this trip. I know it isn't entirely accurate, but it motivates me to spend more time on the nut behind the wheel before I start obsessing about other mods!
The torque app said I was at 41.2mpg for this run, which was really close for just doing the basic set up. I am switching to the SGII, but had just wired it into the Civic, and don't have a second cable yet. Wal-mart has the cables for $11, so I'll probably get one (or two) there.
I am abandoning the torque app for daily use because it requires restarting the app every time the car is started in order to see all of the sensors. Sometimes my mpg average is 5-10mpg, sometimes it is 50+mpg, it is a little picky about resetting trips logs when yo are moving. If you have the time to spend to make it work it is a great tool. If you don't have the time to spend, it still gives you temps, and instant mpg after you restart the app.
Thanks everybody for contributing to this site. I have learned so much from so many of you. Long live the search bar!