Sorry that I'm responding to late, but I was out of town when this discussion was active and didn't find it until now. I've been experimenting with the Accord DX for a while. I found that the best way to make it shift is on its own. When you let off of the gas then go back on, it's engine braking, then you're getting the engine back to speed. This wastes fuel. The best way that I've found with my Accord is to just accelerate very slowly. It will shift from 1 to 2 to 3 at around 2100 rpms, then at around 2300-2400 for 4th gear. Also, if it's safe to keep the speed above 52 in the country, do so because this is about when the torque converter kicks in. At 55 mph on the highway, you should be seeing much higher numbers than 28. Be certain that you're holding a constant speed. If it drifts off, get back to 55 slowly, not by letting your foot off of the gas or by stomping on the gas.
If you're in a hilly area, I can't help you much on hypermiling techniques because I live in South Florida where everything is flat. Also (and I know that I'm one of the only people on this forum who believes this), if you add about 2.5 oz of acetone to your gas tank with every 10 gallons of gas, you should see an improvement. I think that this makes a big difference in older high mileage cars because of how much gunk accumulates in the fuel system over time. I think that the acetone gets much of this out.
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