Try lowering your shift points a little more if you can without lugging the engine. I drive an '88 & '97 Ford Escort and I usually shift at 2000-2250 RPM. I've found out that about 50 MPH cruising speed is a sweet spot in my '88. I'm averaging between 44 & 45 MPG on both cars, but the '97 has been about 85-90% highway miles. I'd also run the tire pressure up to sidewall max. I always coast down hills (no acceleration) that are big enough to maintain my speed and just as I hit the bottom of the hill I start to accelerate before I lose any speed or momentum. If you are coming up to a red light slow down enough to try to keep the car rolling until the light turns green and other cars get started and out of the way. I've read that it takes about 20% more fuel to start from a dead stop than it does if you can barely keep the car moving. A Scan Gauge will also help you learn your car. They are about $150. US and give you lots of information. You'll be able to see in real time what effects different driving habits have on FE. Plus it can tell you water temp., charging voltage, RPM, MPH, engine load, throttle position, current MPG, tank MPG, trip MPG, gallons used per hour and there are other gauges plus you can program in some of your own in the X gauge feature (up to 25 or 26 extra gauges I don't remember which) and it can also scan the ECU and give you any trouble codes if the check engine light comes on. I bought one back in the summer and have really enjoyed using it. If you are interested in buying one you can go to
CleanMPG, An authoritative source on fuel economy and hypermiling and join and they usually have a group buy where you can get it for $150. Hope this will help you some.