Mods are in sig. Not sure how much of a difference the Powerchip will make. I do both city and interstate driving. If I do 70 on the interstate, I can get well over 30mpg...but I normally do about 80-90, so the mpg's drop to the mid 20s.
I average about 20-21 and have got as bad as 18 with my auto. My best has been 24. I do about 90% city driving and I love to do stoplight racing. Well, not really racing, but jackrabbit starts are fun! I got about 26 as an average when I had my 5 speed in the same driving situations.
20 MPG is pretty poor for a four cylinder, but that's one of the things I have noticed about most Hyundais, they aren't the most fuel efficient cars around. I'm glad they are durable, though.
When I brought my car home, I got 28mpg on the highway, now, after my 4.10's, I get about 23-25 on the highway and 20-22 around town. Mods in sig. BTW, I know it aint an Elantra, but I just wanted everyone to know that even though I gave up my XD, I didn't give up good MPG's :tongue:
My engine is stock, manual transmission. I bought the multigauge to ration my fuel, and routinely get over 30mpg, driving a mix of highway and city driving. Except for acceleration, I keep it between 5 and ~12 l/km (or whatever the measurement is on the gauge)... definitely keeping it to the left of center as often as possible helps. You can go 80mph and be doing around 10 l/km mileage, which translates pretty well.
One thing I noticed is that in Harrisburg, if you go the speed limit, you can go right through every traffic light like clockwork. It's funny watching people race to the next red light, when I'm just cruisin' along at 25mph, saving gas, and I don't have to stop... I know exactly when the light will turn green so I don't even slow down approaching the intersection. (Maybe just a little bit, heehee.)
My 02 XD is a manual; the engine is stock except for a CAI, polished TB and Kore catback exhaust.
I drive ~3 miles each way to work on city streets. That combined with the hills here in western PA causes me to get crappy milage. When I get out on the highway I get ~28 mpg. The car also weighs a bit more than stock since I've got ~70 lb of speakers/amp/box in the trunk.
So far I get about 30.6 MPG from the computer of my Elantra GT 05. Car is all stock. Ok, I am quite gentle on the accelerator. Highway definitely helps to increase the gas mileage. I do about 45% city, 55% highway.