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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 06-12-2008, 03:32 PM   #1 (permalink)
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E30 Gas Mileage

Ok i keep getting different answers from everybody about this, and i want to figure this out once and for all, officially:

What is the city/highway mileage of the E30 318 and 325?

I have had people tell me such vastly different numbers, and i need to get this straight (as i am looking to buy an E30)

thanks guys!!!
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Old 06-12-2008, 03:38 PM   #2 (permalink)
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The E30 325i gets about 17 in city/light urban. It gets about 26 maybe 27 on open highway (at reasonable speeds). The 318is should manage 23 ~ 24 city and over 30 on the highway (estimated)
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Old 06-12-2008, 04:47 PM   #3 (permalink)
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My 318is gets 25mpg in mixed city/highway driving like I stole the car (gotta rev the m42 to have any fun). Highway 30mpg is easy, and if you do it right 35mgp isn't too hard to get to.
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Old 06-12-2008, 07:06 PM   #4 (permalink)
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awesome thanks guys!

so
325: 17/26 city/hwy
318: 23/32 city/hwy (maybe?)
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Old 06-12-2008, 07:26 PM   #5 (permalink)
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^^^ the 325i numbers sound about right to me. in combined driving, i get between 20 to 23 mpg.
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Old 06-12-2008, 07:38 PM   #6 (permalink)
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yup my 325i gets 18-19ish city....and 25's highway...
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Old 06-12-2008, 08:51 PM   #7 (permalink)
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the 318 with the m42 i would say 25/30 easy and probably more like 25/32-33 up to 35.

I think the m10 318s get pretty good numbers as well.
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Old 06-12-2008, 08:52 PM   #8 (permalink)
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thats not very good mileage... just buy an e46
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Old 06-12-2008, 10:34 PM   #9 (permalink)
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i know i am beginning to think that. I had originally thought the E30 325 gets better gas mileage than the E36 325 but i guess i was wrong. I need something with good gas mileage (i commute) and i want a BMW. (and relatively cheap). It sounds like i may be going for an E30 318.

If you slapped a turbo on a 318 would it increase the gas mileage on the highway?
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Old 06-12-2008, 10:50 PM   #10 (permalink)
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If you slapped a turbo on a 318 would it increase the gas mileage on the highway?
No, and if you use the turbo, mileage will take a cliff dive
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Old 06-13-2008, 01:20 PM   #11 (permalink)
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really? how so? don't turbos increase mileage? (VW Jetta TDI, Saab turbo, any semi truck)

i know under heavy acceleration a turbo will increase power, and gas mileage will be terrible, but at highway cruising speeds, doesn't a turbo improve gas mileage?
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Old 06-14-2008, 07:04 AM   #12 (permalink)
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really? how so? don't turbos increase mileage? (VW Jetta TDI, Saab turbo, any semi truck)

i know under heavy acceleration a turbo will increase power, and gas mileage will be terrible, but at highway cruising speeds, doesn't a turbo improve gas mileage?
Well, I'm pretty sure a semi truck DOESN'T get good mpg. And a turbo diesel is way different then a turbo gas car.
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Old 06-14-2008, 08:13 AM   #13 (permalink)
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between 22 US MPG and 25 US MPG
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Old 06-14-2008, 08:31 AM   #14 (permalink)
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Yes a turbo vastly improves the performance and fuel milage of diesel engines but in gasoline a turbo often hurts fuel milage figures.
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Old 06-14-2008, 01:40 PM   #15 (permalink)
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well except Veedubyahs Golf GT eingine - the TFSI which has a turbo and a supercharger as well as direct fuel injection, getting 170 hp out of 1.4 liter and an average MPG of 40-50
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