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Run some techron (the more expensive one) through it.
Remember that you directly choose how much gas you burn - the ECU must match the amount of air you admit with the throttle, to keep the AFR correct. (you can really tell if you have a pod filter, and hear the sucking - I don't really remember if you can tell with the stock airbox, if that's what you have).
Even if you're easy on the throttle and keep RPM's low, you're talking about freeway milage that other people get. On the highway I get great milage (AND with a super low compression, smoky, half dead motor), when I can make myself act like an adult with the throttle. In town? probably 8-18, depending on exactly how grown up my driving is.
Pretend you're driving a limo, and see how your milage improves. But either way, in town milage is MUCH worse. Starting uses a huge amount of energy, and stopping wastes a huge amount of energy.
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