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Old 11-12-2003, 05:09 PM   #1
SubaruImpreza_power
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Question What uses more fuel? 1.8L or 2.5L?

I'm talking about in terms of keeping it at highways speed.. With my 1.8L I have to always floor the car to get it to move.. And the 2.5L it takes much less effort to get to highways speeds without having to ring the engine out.

So is their like some fine line into when the engine is efficient?
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Old 11-12-2003, 05:15 PM   #2
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What's your average mpg?
I typically get 24 mpg + on an average tank of gas, about 75 % hw miles.
AO
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Old 11-12-2003, 05:20 PM   #3
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Ya, im getting crappy gas mileage with my 1.8 cause i have to floor it to go anywhere... so maybe it does use more fuel?
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Old 11-12-2003, 05:21 PM   #4
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last time I checked on my 1.8L I got around 23 Mpg... I forgot what I got on the 2.5l

However I Find I can't get over 200 Miles without having to go get gas again because I'm low.. I cant make a week on a full tank.
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Old 11-12-2003, 05:23 PM   #5
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Quote:
Originally posted by Kostamojen
Ya, im getting crappy gas mileage with my 1.8 cause i have to floor it to go anywhere... so maybe it does use more fuel?
yeah.. I got my 1.8 up to 90 Mph yesterday... However to keep up with traffic I always have to floor it or near ways to floor it.. My gas mileage sucks...
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Old 11-12-2003, 05:47 PM   #6
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I think for the early imps, the 2.2 got better milage than the 1.8. On the highway I get better milage with the 2.5 than i did the 1.8. BEST ive seen with 2.5 expressway was 33, best with 1.8 was like 30.
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Old 11-12-2003, 06:15 PM   #7
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hmm.. I kinda thought so... I think it deals with the engine size and keeping it up to speed.
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Old 11-12-2003, 06:52 PM   #8
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I had a 95L 1.8 and I got about 250 to the tank. I have an RS now, and it gets between 325 and 425, depending on driving situations. The 425 was this past summer on a vacation. The 325 is if I drive like an idiot on the back roads do 85+ on the highway.

The 1.8 was a gas guzzler...for me anyway.

Jarrad
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Old 11-12-2003, 08:27 PM   #9
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the 1.8's have smaller gas tanks.
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Old 11-12-2003, 09:59 PM   #10
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the 1.8s have like a 13 gallon tank.

I think you are right though, more throttle is needed to not only get up to speed, but also to overcome drag at higher speeds, and when you go WOT it just pours the fuel in, so where i get by with 75%-85% throttle in 5th to pass on the expressway you have to redline in 4th to pass anyone with a 1.8.

So I would not be suprised if the 2.5 actually gets better mileage for normal daily driving.
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Old 11-12-2003, 10:32 PM   #11
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fuel efficiency depends on many things...but they all boil down to how efficient the engine is running

its possible that the 1.8 L might get worse fuel efficiency (assuming gearing and weight are constant) than the 2.5 because it has to carry around more weight. To reach the same speed as the 2.5 it must work harder.
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Old 11-13-2003, 02:53 AM   #12
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I mean really, it works a TON harder! I have to sit at 6000rpms in 3rd gear to go up hills when im up in the sierras Meanwhile, RS's are like doing 3000rpms in 5th gear doing the same speed...
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Old 11-13-2003, 02:59 AM   #13
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yea... Normal around the town driving the car shifts at 4,000 Rpms... When I get on the highway I always have to floor it.. The car shifts at 6,000 which is avout 200 rpms from the rev limiter.

One thing that bothers me... If I get a full tank a gas.. My Needle will stay near a full tank for the longest time.. Then out of the friken Blue the Needle will go from a Full Tank to above Empty in a blink of an Eye..

I will never forget the time I was in the deep parts of CT and was climbing this hill and When I last looked at the gas needle it was at a half a tank.. When I was 1 Min. into the Hill The Gas Needle was Below the Empty symbol..
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Old 11-13-2003, 03:04 AM   #14
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I also find my Auto 1.8L losses speed much quicker then my 2.5L Forester.
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Old 11-13-2003, 03:12 AM   #15
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My gas gauge is doing fine, but ya ive seen other folks with that problem. BTW, the rev limiter is at 6000rpms... Peg it to see for yourself
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Old 11-13-2003, 03:14 AM   #16
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Quote:
Originally posted by Kostamojen
My gas gauge is doing fine, but ya ive seen other folks with that problem. BTW, the rev limiter is at 6000rpms... Peg it to see for yourself
I know.. I hit it at least some 15 times... I wonder.. are their any downfalls for spinning a tire at 60 Mph if it loses traction?
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Old 11-13-2003, 07:17 AM   #17
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I get around 20MPG with my '95 2.0NA... The mods include K&N cone filter with a sort of CAI setup, the throttle body coolant bypass and a muffler.

D.

PS: I think the cone filter messes up my MAF. No codes though.
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Old 11-13-2003, 08:47 AM   #18
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Default Gas..

I get about 25 MPG on my 1.8L and it has 205,000 miles on it. The custom exhaust really helped my MPG, also the power.

Max
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Old 11-13-2003, 10:48 AM   #19
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I think how hard you guys push your 1.8's has alot to do with it. Like what's been mentioned, the 1.8 has to work alot harder to achieve the same speeds, so it goes with out saying that you'll use more gas. I think if you were to have a constant hw speed of 55, you'd find the 1.8 more efficient, however, I don't drive like that.
AO
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Old 11-13-2003, 11:50 AM   #20
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i'm really happy to read that the 1.8 impreza have 13 gallons tank. i've checked many place, and asked on this board before, and i got no information that confirmed the 1.8 tank was smaller. before i did my swap , my 93 awd auto was so thirsty it was getting about 17 mpg. of course, i was always flooring it, but I ran out of gas a couple times before storing it. now, with the 01 5spd 2.5, i'm getting 24 mpg. but still can put more than 12 gallons in my tank before running out of gas
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Old 11-13-2003, 02:28 PM   #21
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My 1993 has a 11.2 gallon tank
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Old 11-13-2003, 04:01 PM   #22
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I can Say the 1.8L and 2.5L are not geared the same... I found out today... I left my house at 5:20 AM I got to work before 6AM. However if I did that in my 1.8L I would of been late.. at least like 6:10Am.
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Old 11-13-2003, 09:16 PM   #23
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LOL thats a real scientific way to judge gearing.
My 95 L is 13 gallon, ive for a fact filled it with 12.5 gallons before (was cutting it close on that trip). 93s are really that small!! I thought my tank was tiny.
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Old 11-14-2003, 02:10 AM   #24
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Ya, dinky tanks... Ive actually manged to get over 300 miles on a tank a couple times, but thats only on long trips with constant speeds... Going to work/school I barely make it over 200 a tank

The cool thing is no matter what the gas price is, I still never go over a Jackson
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Old 11-14-2003, 03:18 PM   #25
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just listening to what you guys are saying...although I don't have a Subaru (yet, looking at the '87 GL in a few hours) in my DeVille with the 4.9 V8 (200hp 275ft. lbs tourqe, PFI, pushrod) I never, ever have a problem gaining speed or passing anyone, even doing 80mph on the thruway.... of course my 1st gear last until 45mph and 2nd goes to almost 90 (4 speed auto).....aroudn town, like back and fourth to school and work and stuff I get 17mpg, if I do more driving on open roads (45-60mph) with the cruise on, I get almost 20, but on the thruway, doing 75-80 with cruise control set, and the AC on I get 28mpg, with all the power reserve I need, under normal driving, I get about 300 miles to the tank, if I was to do nonstop highway, I would get 400-500 miles to a tank...my tank is 18gal..... I just find it strange that the smaller engines in lighter cars would have more power then this and all, plus it seems like the smaller engines are really stressted just to do daily things like keep with traffic, pass someone, merge etc......

Then again the '87 GL wagon I am gonna be looking at is 1.8 (I think) and all of 95hp and like 11ft lbs of tourqe, so not much is to be expected of that....oh well, $100 winter car, can't argue with that
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