This topic is old, I know, but I just wanted to second night9's experience to any one cursing their "low MPG" Elantra who stumbles upon this thread.
I've gotten 45.5 mpg driving hilly interstate, keeping to the 65 mph speed limit with a light foot on the accelerator. My daughter achieved tanks of 39.2 and 38.8 mpg on an 800 mile trip, with 2 passengers and a week's worth of luggage. These figures were NOT determined by the Elantra's slightly suspect dashboard computer, and this is highway mileage, not around town.
A Scangauge II really helped us find the sweet spot with the throttle, but the technique just requires the using the lightest pressure on the pedal to maintain speed.
Additionally, I found the Elantra coasts in 6th gear almost as if it were in neutral. The Shiftronic transmission can also be used to coast in 6th much longer before downshift than in regular automatic mode. Take your foot of the gas going downhill! (And before anybody cries about having to use weird techniques to get to Hyundai's EPA number, the above mileages were achieved before I discovered the Elantra's gliding prowess.)
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