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YACT: Sharp Drop in Gas Mileage

D

Dedpuhl

Lifer
I have a 2000 Hyundai Tiburon (plz, no Hyundai jokes/slams/disses/etc) and brought my car in for maintenance a couple weeks ago. The a/c compressor was bad so they replaced it.

Before I brought the vehicle in, my odometer would always reach around 290 miles before I would need to get gas (there would still be one gallon left in the tank). Since the repair work, I've been having to fill up when it barely reaches 250 miles.

What could cause such a drastic drop? I just thought I'd get a professional ATOT diagnosis before I bring it to the shop this week. 🙂
 
AFAIK, the only work was done on the A/C. My a/c use has actually decreased b/c of the change in weather.

Also, I have a 12 gallon tank.
 
Originally posted by: no0b
are you filling up at the same gasstation at a non sloped pump?
Click to expand...

I've filled up 3 times at 2 different places. They are the same places I usually get gas.

There was talk a while back about the EPA forcing this area to use reformulated gasoline, but it has been put on hold. So, I think the gas is the same. (I use mid-grade - 89). If reformulated gas is used, the business is required to put a notice at the pumps.
 
Did the mechanic 'fix' it by jamming the clutch so that the compressor is always on? 😉

i think youre probably just imagining shit.. or something.
 
Nah I think they replaced it. It was warranty work at a Hyundai dealer.

I always monitor my gas usage, so I can't be imagining anything.
 
well, if it's under warranty still, take it back and question them about it.
 
It might be the gas. It seems to always happen with my car during the winter season. I always seem to get a few less MPG. I believe they put in some sort additive to help prevent gas from freezing in your tank.
 
Originally posted by: ItTheCow
It might be the gas. It seems to always happen with my car during the winter season. I always seem to get a few less MPG. I believe they put in some sort additive to help prevent gas from freezing in your tank.
Click to expand...

Ding Ding Ding!!! We have a Winner!
 
Yes, I know it should not cause a 15-20% decrease in fuel economy, but check the tire pressure. It could account for almost 10% of your loss. The other 10% could be accounted for the cooler fall temperatures.
 
Originally posted by: CrackRabbit
Originally posted by: ItTheCow
It might be the gas. It seems to always happen with my car during the winter season. I always seem to get a few less MPG. I believe they put in some sort additive to help prevent gas from freezing in your tank.
Click to expand...

Ding Ding Ding!!! We have a Winner!
Click to expand...

wtf?
 
Originally posted by: CrackRabbit
Originally posted by: ItTheCow
It might be the gas. It seems to always happen with my car during the winter season. I always seem to get a few less MPG. I believe they put in some sort additive to help prevent gas from freezing in your tank.
Click to expand...

Ding Ding Ding!!! We have a Winner!
Click to expand...

never noticed it before in Baton Rouge...
 
Originally posted by: CrackRabbit
Originally posted by: ItTheCow
It might be the gas. It seems to always happen with my car during the winter season. I always seem to get a few less MPG. I believe they put in some sort additive to help prevent gas from freezing in your tank.
Click to expand...

Ding Ding Ding!!! We have a Winner!
Click to expand...
We don't do that in the south though.....It's possible your new compressor just takes a few more ponies than your old one, even with the clutch disengaged, your compressor could use anywhere from 2-12HP (depending on the compressor of course). I once had to replace a compressor in an old Ford Ranger I used to have, I went from ~20mpg to ~24mpg, simply because the aftermarket compressor I bought was more efficient, I've seen the difference swing both ways as I also had an old Crown Vic that went from ~25mpg to 18mpg by replacing the compressor.

Other possibilities, spark plugs, plug wires got moved and are now touching the chasis causing a slight drop in voltages, fuel injectors are dirty/fuel has water in it, tire pressure, thermostat, dirty air filter, dirty oil, dirty breather, o2 sensor, clogged/malfunctioning EGR valve....I'm sure I'm forgetting something....
 
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