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I would assume its due to differences in engine breaking. If you put both cars in neutral on the same hill assuming similar conditions, weight, drag coefficient and tire pressure they should coast about the same.
For Example: My Elantra when I lift off the pedal will cut fuel to the engine and starts to engine break in gear to keep the motor spinning. This I assume is to save fuel when slowing down. My truck on the other hand will drop its rpm and the engine keeps running normally, burning fuel. The drag on the Elantra is very much bigger than in the truck. Going down a hill the truck will coast much faster than the Elantra in gear. If I put them both in neutral the Elantra coasts forever and the truck will slow down slightly less quick.
All this tells me is that the older cars ECU is telling it to do something different than the newer car which is causing it to coast down hill better.
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