('14-'18) 14 Forester XT gas mileage - Subaru Forester Owners Forum
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post #1 of 36 (permalink) Old 05-21-2017, 09:42 AM Thread Starter
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14 Forester XT gas mileage

Hi I've had my XT for almost a month. First three or four trips I did I got any where from 29-32 mpg on the highway. I just got 25.8, haven't changed any of my driving habits. Same fuel. Any ideas what could have caused such a big decrease?

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post #2 of 36 (permalink) Old 05-21-2017, 12:35 PM
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Have you experienced this on multiple tanks of gas or just a single one so far? Anecdotal evidence incoming but I've experienced this issue with my 2017 XT on a Christmas trip to Illinois.

Fueled up at a gas station after making the trip up and got about 28 around town/highway afterwards. Got a second tank of gas from the same place, same premium, not too long after and only managed about 24 and the vehicle was in noticeable distress. I thought I wouldn't be able to make it back to Alabama. I fueled up at a different station before heading back and thankfully everything was normal after that.

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post #3 of 36 (permalink) Old 05-21-2017, 01:27 PM
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How are you measuring gas mileage? About the only sure-fire method I know is to fill up the vehicle and note the mileage. Then, every time you add gas, try to fill it up again, note the mileage again, and use the gas added gallons divided into the miles traveled for you MPG.

Off the op of my head, I would say 28mpg around town is rather high. 24mpg is a number frequently seen in the forum. So, maybe some nut-job in your neighborhood got access to your car, but instead of stealing your fuel he put some extra gas into your tank. Maybe?


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post #4 of 36 (permalink) Old 05-21-2017, 01:49 PM
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Mine was about 20 or so miles of highway travel and very little town travel.

I will say that I average about 26 in town but usually only get 28 or 29 highway wise. I've never hit 31 or 32 after any reasonable trip though.
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post #5 of 36 (permalink) Old 05-21-2017, 02:10 PM
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Just a gas gremlin. Ignore it. Or eat more beans

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post #6 of 36 (permalink) Old 05-21-2017, 05:35 PM
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Consider yourself lucky, my 2016 XT gets 19.5 MPG with premium gas. And 90% of my driving consists of highway miles going 60-70 mph on cruise control. At what point does Subaru's MPG claim turn into a straight up lie?
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post #7 of 36 (permalink) Old 05-21-2017, 05:41 PM
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Something is not right @eggnog316 . I run Shell 93 Premium gas in our 2017 XT Touring and consistently get 26 MPG running 80 mph on cruise control (straight, level I-80 in Ohio).
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post #8 of 36 (permalink) Old 05-22-2017, 04:28 PM
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19.5 on the highway? Are you driving in S# all the time? I wouldn't blame you if you were but still...

I've never had that poor of mileage. Not even around town.
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post #9 of 36 (permalink) Old 05-23-2017, 11:50 AM
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It's the winter fuel blend / or cold (~0-30 deg). My 16 XT got as low as 14mpg city, and 19 hwy this past winter. Last summer I got 21 city, 28 highway. I noticed the past two weeks I'm getting about 20-25mpg, so they must have switched blends to summer. I always use 93 from the same stations. I rarely use S or S#.

It kinda sucks not even getting 200 miles out of a full tank in the winter.

I just got back from vacation renting a Chevy Cruze. It was a hybrid monstrosity that got nearly 60mpg. The engine kept shutting off and on to conserve fuel. It was awful. I owned a 90hp Scion before, and this Cruze was way slower than that. I wanted to just drive it off a cliff. I haven't been so happy to get back to my XT after vacation. I'll stick with the low MPG. Perspective.
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Last edited by Philth; 05-23-2017 at 12:09 PM.
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post #10 of 36 (permalink) Old 05-23-2017, 12:54 PM
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Quote:
Originally Posted by eggnog316 View Post
Consider yourself lucky, my 2016 XT gets 19.5 MPG with premium gas. And 90% of my driving consists of highway miles going 60-70 mph on cruise control. At what point does Subaru's MPG claim turn into a straight up lie?
This sounds like mine. Cruise at 70-75MPH to San Diego and get around 23 highway. City driving less than 10 mile trip is around 16-20 and I never Accelerate faster than 40%, if I use boost a little the whole trip MPG is ruined. My average for 2000 miles is 18 according to the computer. 16.8 according to my gas receipts. This sucks.
My commute is 2.5 Miles City. Always get 15-16MPG. Guess thats whats killing me. Didn't realize this was gonna be a problem.

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post #11 of 36 (permalink) Old 05-23-2017, 01:05 PM
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Quote:
Originally Posted by richard478 View Post
This sounds like mine. Cruise at 70-75MPH to San Diego and get around 23 highway. City driving less than 10 mile trip is around 16-20 and I never Accelerate faster than 40%, if I use boost a little the whole trip MPG is ruined. My average for 2000 miles is 18 according to the computer. 16.8 according to my gas receipts. This sucks.
My commute is 2.5 Miles City. Always get 15-16MPG. Guess thats whats killing me. Didn't realize this was gonna be a problem.
Wow. California gas must really suck. I get better mileage than that in the city. And I'm Stage 2.

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post #12 of 36 (permalink) Old 05-23-2017, 01:16 PM
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Wow. California gas must really suck. I get better mileage than that in the city. And I'm Stage 2.
Definitely not E10 friendly. Still love the car. Extra $40 a month in gas isn't ideal but better than no power.
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post #13 of 36 (permalink) Old 05-23-2017, 04:39 PM
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I'm using 93 and get 28/29 mpg per computer average per tank. Mostly near sea - level driving, 80‰ highway. Current tank 3/4 full showing 31.2 pulling into driveway this evening with A/C. Too lazy to do math, but overall range per tank is roughly right. Reset mpg/trip odo after every fill-up.

I do try to look ahead and anticipate slowdowns to reduce accelerator needs without being a traffic blocker. Paddles are useful for this without lighting up taillights. Also, it is amazing how little throttle input is needed to maintain highway speeds. The 2 liter gives good mileage off boost even when moving a 3700lb brick through the air.
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post #14 of 36 (permalink) Old 05-26-2017, 01:31 PM
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Anyone experiencing better mpg with increased mileage on their 17's? Currently at 1500mi. Not expecting anything drastic. Maybe 1-2mpg better? Currently getting the stated 22mpg with mostly City driving...
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post #15 of 36 (permalink) Old 06-03-2017, 07:33 PM
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I'm getting between 29-32 on premium from a '14 XT. My commute is about 35 miles each way, highway, rush hour traffic, hilly terrain, and 5k+ altitude. Last month I did a 200 mile drive, 55-60 degrees outside temp, mostly flat, and saw 35mpg for a while - finished up at 34.5 mpg. No mods on the car, K&N air filter.
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