Mod's will help with the mpg. But its not the total package. Slowing down a bit more and load driving the hills with a FAS on the down side will help alot.
I dont load drive like krousdb or xcel anymore. But I do load drive. I have hills in my daily drive. I use to load drive them to the point that i would let them scrub 10 mph or better off my mph. Not anymore, maybe let them take 5 mph then top the climb and pull a 1 mile FAS.
Another thing that helps is bleeding on slight down hill runs. I have places on my drive where its ever so slightly down hill. I can ever so lightly let out of the gas and watch my speed increase and my mpg go way up on the real time readout in my ScanGauge. I can be doing 65 mph going down the hwy hit one of these areas and be at 70 mph and see a steady 60 mpg on my SG.
Hills can be intresting in the FE game. i would much rather drive them than ubber flat land. Where P&G and or bleeding are your only options to improve mpg. There just flat boring options and not worth my time or effort.
09 HCHII, w/Navi
07 Mazda3 S Touring, 5MT
Mild Hypermiler or Mad Man?
Based on what you have just described, I would say that you drive exactly the way that I drive. I don't loose more than 5 MPH while climbing hills and un slight downhills I also bach off to see the FE skyrocket. On the steeper downhills I FAS. Hills are your friend for sure.
Wayne's driving is much more extreme than mine which is exactly why he will always post better numbers than I will. I can live with that.