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So my gas mileage to the tank has progressively decreased. When I first got the car (0 miles) it was 439 miles to the tank. Now 1 1/2 months later (1,600 miles) it is down to 383 miles to the tank. This is filling it literally to the max. I thought mileage got better as you break it in, not worse. Please note: this is based off the mileage it states on the dash.


Thanks
 

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1600 miles, you're talking like 4 fillups...probably nothing to worry about.


You also didn't state what kind of MPG you are seeing...note that is very subjective depending on driving conditions. The worst thing for mileage is idling...in that you're not moving but burning fuel=0 mpg. Stop and go is just as bad.


With that said, best guess your first run with the car you were averaging over 27 mpg, now you're averaging shy of 24 mpg based on usage of 16 gallons (minus reserve). Probably completely normal based on driving conditions.
 

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Not clear how "Trip Computer" calculates mpg or "miles per tank". Hand calc after the first 2-3K miles probably gives the best accuracy. I'm at about 2.000 miles and my avg mpg has gone from 22 mpg to 24 mpg over 6 fill-ups when driving 50% on WNC twisty mountain roads and 50% on hilly Interstates. I'd be surprised if there were more than 1-2 mpg improvement.

My best mpg for about a 20 mile Interstate stretch was about 32 mpg. I would expect to do better on the Florida Interstate flat-lands.
 

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24,000 miles here and still seeing 28mpg avg on highway. That's pretty good with the way I drive (75-85mph all the time), not driving like a grandma. If I try to drive like a grandma I'll get 32mpg easy.
 

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Mine gets a max of like 280 miles for the tank. Although my average is 16 mpg. I also have 20k miles on my car now.
 

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MadMax has it right. The mileage to empty will change based upon your average mpg. If you have a tank that is mostly highway miles your average mileage will be higher and the estimated miles remaining on the current tank of gas will be higher. If you have a lot of stop and go the average will go down and you remaining mileage will drop. You can always reset the counters and let the averages start over. There is also a setting that lets it reset automatically ever time you fill up.
 

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Just like these guys are saying there is really no reason to freak out. You will start to notice some improvements near 3k miles or so. When I got my car it had over a 400mi range. When I drove it for a while the range went down to under 390 after the first few weeks. A month or so ago I had the range back to over 400mi/tank. Since then we have switched to winter blend and I am getting 394mi/tank. It really depends on how you drive and conditions around you. We have a lot of construction going on right now and the highway sucks so I am getting less than what I used to. I used to get about 24mpg or better going to or from work. Now I'm happy if I can get 22. I also use a premium fuel (not to be confused with premium grade 91 fuel) from Shell. Whether or not you subscribe to that is up to you (ie using "premium" fuel from places such as shell, BP, etc... and not using it from cheap gas like Marathon, Gas America, Walmart [Murphy], etc...). Also be aware aware if you have an Ethanol rating at your pump and how much it is. I believe EPA tests are run on pure gasoline, most consumer pumps have E10 (10% ethanol), you can thank our wonderful federal govt. for that bit. There are possibly places near you that do provide pure gas (slightly more expensive just as E85 is less expensive due to less actual gasoline), you should be able to find those at Ethanol-free gas stations in the U.S. and Canada
 

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Also, sign up on fuelly (Fuelly - Track and Compare your MPG) and put down your actual mileage. When you fill up your car only go to when the pump shuts off, that is a fairly accurate target for fillups each time. Get a receipt at the pump and mark your mileage before you take off. It will ask you to input mileage since last fuel up, how much gas you put in, and what the price of the gas was. This will calculate for you your exact mileage for your car and the money you've spent on gas over the life of your vehicle (depending on how faithfully you use fuelly). The calculation on the car is decently accurate but I have noticed it is like any other, sometimes above average, sometimes below, and others spot on. I suggest all of our members use fuelly, only 3 Cadenzas on it so far, that's sad.
 

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Sorry for my ignorance, what's the difference in the winter blend fuel?


Just like these guys are saying there is really no reason to freak out. You will start to notice some improvements near 3k miles or so. When I got my car it had over a 400mi range. When I drove it for a while the range went down to under 390 after the first few weeks. A month or so ago I had the range back to over 400mi/tank. Since then we have switched to winter blend and I am getting 394mi/tank. It really depends on how you drive and conditions around you. We have a lot of construction going on right now and the highway sucks so I am getting less than what I used to. I used to get about 24mpg or better going to or from work. Now I'm happy if I can get 22. I also use a premium fuel (not to be confused with premium grade 91 fuel) from Shell. Whether or not you subscribe to that is up to you (ie using "premium" fuel from places such as shell, BP, etc... and not using it from cheap gas like Marathon, Gas America, Walmart [Murphy], etc...). Also be aware aware if you have an Ethanol rating at your pump and how much it is. I believe EPA tests are run on pure gasoline, most consumer pumps have E10 (10% ethanol), you can thank our wonderful federal govt. for that bit. There are possibly places near you that do provide pure gas (slightly more expensive just as E85 is less expensive due to less actual gasoline), you should be able to find those at Ethanol-free gas stations in the U.S. and Canada
 
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