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YACT: Getting really bad gas mileage on 05 Accord...I4

F

FearoftheNight

Diamond Member
Is there anyway I can end up w/ 18 mpg on my 4 cylinder when the epa is 24 city and 34 highway when most of my driving is highway driving 60-80 mph? I'm really stumped on this one.

Information: This car is fresh to 10k miles. My dad was the person driving it before I've been driving it. He claims to have been getting ~28 mpg on his daily commute. I've been monitoring it. This car has new brakes and rotors. Most of the driving is on highway w/ some bumper 2 bumper traffic now and then.

Usually I have the stereo/cd player on. My radar detector. I do a lot of night driving so the headlights, ac or heat. This car is an automatic transmission. I would say most of my driving is 75% highway cruising.

Week 1: 20 mpg I was driving a little aggressively and leadfooting it. Understandable gas mileage I guess.

Week 2: 24 mpgs I was driving as conservatively as I could crusing around at 55-70 mph.

Week 3: 18-19mpg. Wtf. I don't drive aggressively anymore.

Week 4: ~20 mpg.
 
Either engine trouble, a leak, dragging brakes (though HOPEFULLY you'd realize that before they melted right off), or transmission trouble.
 
Originally posted by: sniperruff
turn off all electronics and close the windows, and use manual cruise control.
Click to expand...

In Florida, with the current weather (not even fully summer yet), that would kill a person.

 
Heat, AC, aggressive driving styles, going too fast (MPG gets worse the higher you go after a while) and several other reasons.
 
Originally posted by: Nikamichi
Don't idle your car
Turn off your AC
Stay on the highway
Slow down on the pedal
Click to expand...

If gas mileage drops that much, the problem is more than just technique.

We need more info. Did you used to get higher mileage? Does the engine idle all right? Any smoke out of the tailpipe? Does the transmission shift smoothly, and all the way up to top gear on the freeway? Any unusual sounds/smells/vibrations?
 
Originally posted by: brxndxn
Originally posted by: sniperruff
turn off all electronics and close the windows, and use manual cruise control.
Click to expand...

In Florida, with the current weather (not even fully summer yet), that would kill a person.
Click to expand...

well, do you want to do the 34mpg or not?
 
what type of accord?

i have a 2004 honda accord i4 (built in mexico). i average 33 MPG...my best ever on a full tank was 38 MPG (that's with no ACC and cruising no faster than 65, 90% freeway)
 
Originally posted by: isekii
maybe you're driving like an a$$hole.
lead foot ?
Click to expand...

No? No lead foot either. I've been special attention not to do that. Also I just got it back from the dealership w/ new pads and rotors.
 
Put it in overdrive on the interstate. You know, the notch in the gear selector above the one it automatically stops at when you put it in drive.

P
R
N
OD Put it here
3 Hondas stop here
2
1
 
Try putting in a bottle of fuel injector cleaner next time you fill up with gas. You can get them for ~$3 at an auto parts store. I really doubt that is what your problem is, especially with a low amount of mileage, but it couldn't hurt.
 
Check your tire pressure. Low tire pressure can significantly reduce gas mileage, because it will increase rolling resistance.
 
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