Forester wilderness 2023 , bad mpg.

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I have the 2023 forester wilderness I love the car but the gas mileage is absolutely terrible . In town driving average 9 to 11 mpg . Not rough with the car , I drive it in s mode. My car has 4700 miles. These mpg’s has always been. Is this normal? No off roading .
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i have a '23 sport that has different tires and possibly gearing ratio..my averages on light traffic roads and expressways are around 25/30..a bit below epa estimates..unless you do a ton of stop and go driving yours should not be that low even in the wilderness model...if you haven't done so yet, I would fill up, drive a constant 60 on an xway for 50 miles or so, fill up again and calculate mpg..if still way low show results to your subaru tech..good luck
 
Curious to know if you drive in I Mode instead of S Mode if you get any significant improvement in mileage? Agree with above post that something is wrong if you are getting such low mileage on a relatively new vehicle. I have '22 and '24 Forester's that get around 26 to 28 in all around driving. Little less during winter (live in snow belt). The S Mode is going to cause your engine to rev much higher and has to burn more gas if you use it all the time.
 
I live in the Midwest these mpg are summer time . I do not drive in s mode . My mpg is worst than a jeep grand Cherokee . No that crazy no off road just city . Subaru should be ashamed of this vehicle with this gas mileage . I always believed that it should have been a turbo . Don’t understand they knew it would consume more gas to operate. Am I the only one with 10 mpg? If so they need to let me know the issue . They being my dealership . I have an appointment with my dealership on this issue. It has been bad mpg since day one . I have about 4800 miles now. I will post the results of the findings . This vehicle is leased .
 
I have the 2023 forester wilderness I love the car but the gas mileage is absolutely terrible . In town driving average 9 to 11 mpg . Not rough with the car , I drive it in s mode. My car has 4700 miles. These mpg’s has always been. Is this normal? No off roading . View attachment 2544
NO!! Not normal, not normal by a long shot. We have a 2022 Forester, not. Wilderness but I believe th motors are the same or at least similar and if I’m not getting 25 to 26 in town I’m disappointed. We have a 2022 Ford F150 Econo-Boost truck that gets 10 mpg when hauling a 26 foot, 6000 lb trailer. Take it back to the dealer, they have work to do.
 
The regular forest is different than the wilderness. For one this is the feel of quickness in the rpm’s . I have had about 5 forester all the trim levels . But this is the one that a wilderness. It will out perform any stick forester in bad conditions absolutely . The tires suspension and higher ground clearance and different shocks . Computer changes for engine rpm’s all those things may contribute to the difference in mpg’s
But as I stated before I believe this 2.5 liter motor should have been a turbo to begin with from Subaru engineering. Needs more power .
 
Does the car ever smell like gasoline? It is hard to believe that your gas mileage could be so lousy. A fuel injector might be leaking gas into the intake manifold, and, an interesting factoid, is that the extra fuel will not burn completely in the engine because there will not be enough oxygen to burn it all. Downstream, The cat will burn the extra gas and overheat!
If you like to drive with your foot to the floor (and wish you had a turbo) then you may be more aggressive than most, but it is still quite unusual gas consumption. If S-mode stands for "Sport" then it will extract more performance by revving higher before it shifts, but that is not enough to explain this problem.
 
The regular forest is different than the wilderness. For one this is the feel of quickness in the rpm’s . I have had about 5 forester all the trim levels . But this is the one that a wilderness. It will out perform any stick forester in bad conditions absolutely . The tires suspension and higher ground clearance and different shocks . Computer changes for engine rpm’s all those things may contribute to the difference in mpg’s
But as I stated before I believe this 2.5 liter motor should have been a turbo to begin with from Subaru engineering. Needs more power .
I understand the differences between the Wilderness and The Touriing, I’ve drooled over a Wilderness for a while now, but the mileage should be better then a third of what most folks are getting. I’m surprised that you haven’t gotten a “Check Engine Light”. All that fuel has got to be going someplace. Be interesting to pull a spark plug and see what it looks like.
 
i have a '23 sport that has different tires and possibly gearing ratio..my averages on light traffic roads and expressways are around 25/30..a bit below epa estimates..unless you do a ton of stop and go driving yours should not be that low even in the wilderness model...if you haven't done so yet, I would fill up, drive a constant 60 on an xway for 50 miles or so, fill up again and calculate mpg..if still way low show results to your subaru tech..good luck
In town driving about 8 miles per day .
 
Check air filer, injector and fuel line filter. Could have been bad gas with substantial debris from low fill station fuel level. Also bad O2 sensor(s), sometimes you feel vehicle boost lag on uphill sections if this a problem.

Other readons are drive style, but that seems unlikely as you are an experienced owner.

Reasons for crappy fuel performance
 
I have the 2023 forester wilderness I love the car but the gas mileage is absolutely terrible . In town driving average 9 to 11 mpg . Not rough with the car , I drive it in s mode. My car has 4700 miles. These mpg’s has always been. Is this normal? No off roading . View attachment 2544
I have a 23 Wilderness and average 25/26 mpg consistently. Occasionally, I tow a trailer and motorcycle (1250-1500 miles each time) and still get 24 mpg.
 
Thank you, Passerby2, for the link.
I read the reasons why one gets poor mileage, like the veritable "lead foot" syndrome. It helps to remember that the brake pedal should be used in moderation (by looking ahead and anticipating slow downs ahead) since the acceleration is paid for with the gas pedal, it helps sometimes to just remove one's foot from the gas pedal and ---coast. Only brake when you absolutely have to do it!
IMHO,
Perhaps the most salient reason for bad gas mileage is the engine timing. A lot of people will buy the cheapest gasoline, regular, when the engine actually needs Premium High Octane. A knock sensor can retard the timing, but this means that the spark will come too late for maxiumum power (and fuel economy).
In the old days of motoring, the general public thought that the gas and air make an "explosion" but now more people understand that the gas and air burn at a constant rate. This is the reason that motors have an initial static timing before Top Dead Center, BTDC.
This early ignition allows the pressure inside the cylinder to grow so that the maximum down force on the piston occurs at about 15 to 18 degress after top dead center and this force accelerates the piston down to the bottom of the cylinder. At Bottom Dead Center the piston is done creating power and the rest of the pressure is vented via the exhaust valve. Hopefully, the heat and pressure are captured by the turbocharger for some boost, but in naturally aspirated engines, the heat and pressure are routed to the catalytic converter and the muffler and are gone.
One doesn't need a performance exhaust to understand how a cloggged cat or a restrictive muffler can ruin your gas mileage. A good muffler shop can actually check the back pressure of the system by drilling a small hole and attaching a gauge.
Also a good tip is to check the sparkplugs, especially since the new cars have a lot of carbon from the EGR system and the GDI (Gas-Direct-Injection) that can clog the intake manifold and the intake valves.
 

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