
Originally Posted by
ghostndragon
Turn off ECO. It's worthless, and often results in poorer fuel economy if you don't drive perfectly. I have tested a variety of situations over several weeks with and attempt to limit my driving to just the commute to/from work and eliminate as much variability as possible. Made runs with ECO on all week, ECO off all week, with both Premium and Regular grade fuel....all resulted in very small actual variations in MPG, Second--I really am sorry that you're getting cruddy gas mileage. That being said, the car is capable of doing what you want it to do. There's no reason you should be getting that terrible mileage if you never kick in your turbo. The ECO might be the problem. Or you might need to fine-tune your shifting. I have the Auto so during my "test" phases, the ECU is making all the shifting decisions Third--unless you drive both the Mazda Speed and the Veloster and directly compare them, you can't compare fuel economy between them. I have done that...hence the mileage comparisons that I posted Two different driving styles--shifting, acceleration, etc. It may be that you'd get as cruddy mileage on the Speed. Nothing to write home about, but it was as advertised and not 5MPG under the window sticker Or, it could be the ECO. Fourth--the Mazda 3 sucks. Tin box on crappy wheels. Don't be fooled. You might be able to drive it like you stole it, but if you like a ride that doesn't feel like a railroad car, you're not missing anything. Finally--how fast were you going on your open road fuel test trip? If it was over 50 mph, expect to get lower fuel economy. If you had a head or crosswind of more than 10 mph, expect to get lower fuel economy. If you put it on cruise and had any significantly hilly areas, expect to get lower fuel economy. Any one or a combination of these things adds up to lower fuel economy. Agreed, but consider the fact that with the same driver and similar conditions/speeds/etc, I consistently got WAY over the estimates in my Sonata and always spot on or maybe a little over with my Expedition and previous vehicles. If anything, I drive less aggressively now because I am trying my level best eek out improvements. On trips to GA with the Sonata I routinely set the cruise at 76 mph and still got 34-35MPG out of a car rated at 30 on the highway. On the trip to Chicago in the VT I set the cruise at 65 with a significant headwind going and a tailwind coming back. Results were 27.7 out and 27.9 back. I'd buy the driving style as a possibility if I was spooling up the turbo at every stop light like Mario Andretti, but that just isn't happening. For a 1-2 MPG difference I doubt that most of us would have looked elsewhere but if it was known to be a 5-10MPG difference?.....who knows? I've made a few trips to Sioux Falls, SD from Minneapolis. With low/no wind and averaging 60-65 mph on the highway, I can easily get 36-37 mpg (no, it's not 40 mpg, but I'm not going 50 mph). With a 25-30 mph crosswind or headwind (far too common--one of the reasons I hate making trips to SD), I'm lucky to hit 30-33 mpg. On the other hand, my boyfriend and I packed my V FULL of camping stuff and headed to north central Nebraska, where the terrain is QUITE hilly, averaging 70+ mph on the highways, with a crosswind that I estimated to be a pretty steady 30 mph, and we still got 30.5 mpg. I always calculate by hand, too, so no computer error.