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Old 12-14-2011, 05:43 AM   #1
Zolf
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Default What's your ti's fuel economy?

E36:er's,

Thought I could start a fuel economy thread. There are threads about this but this is what I thought we could do here. Please, just list the year of your ti, current mileage and odometer reading after the gas tank light comes on. The 318ti fuel tank will hold 52 liters (13.7 US gallons) including 8 liters (2.11 US gallons) in the reserve tank. This comes to 44 liters (11.6 US gallons). Please, do not post mpg stated in online reviews/other forums. Post your true "old school" reading: fill up your tank, reset odometer and when the gas tank light comes on...post your odometer reading.

If you are only doing highway, city or a combination, please state so.

A decent 318ti should make around 28-32 mpg. But this is not what I get. Anyways, here it goes:

Model: 318ti M-Sport
Year: '98
Transmission: Automatic
Tyres: Dunlop Winter Sport M3 225/50ZR16
Mileage: 162 000 km
Odometer Reading (on a full tank until gas tank light came on): 430km (267 miles)
Fuel used: Shell, Regular unleaded
Highway km only

My results translates into;
430 km/44 L = 9.77km/L
267 miles/11.6 gallons = 23.0 mpg

What's your reading?

Last edited by Zolf; 12-17-2011 at 07:04 AM.
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Old 12-14-2011, 05:55 AM   #2
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My understanding the fuel tank was 55L.

Model: Racing Technics 328ti Turbo
Year: 1996
Mileage: ??? km
Fuel used: Caltex 98 RON

I roughly get 100kms per quarter city driving, so it works out to be roughly 13.75L per 100kms. On the highway, I got roughly 150km per quarter, so that worked out to be 9.16L per 100kms.

New ECU just installed should be more efficient with sequential firing and closed loop, so I'll post my new findings after I drive my car around a bit.
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Last edited by RAiMA; 12-14-2011 at 06:01 AM.
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Old 12-14-2011, 06:06 AM   #3
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1996 Active, Auto.

The OBC says 30-33 mpg depending on how much city driving I do.
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Old 12-14-2011, 07:24 AM   #4
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1996 Sport, Manual.

I keep track in the "Road Trip LE" app for iPhone. My average over the last 15,879 miles is 27.45 US MPG. That's probably about 50/50 - city/highway.
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Old 12-14-2011, 12:59 PM   #5
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mine varies quite a lot. i do a ton of city driving. i seem to average around 24mpg. i notice a big difference in consumption when i drive very soft to even a more lightly aggressive fun driving style
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Old 12-14-2011, 02:50 PM   #6
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I know you want hard numbers.. but I don't have them. I generally take the numbers on the pump and the numbers from the Odo and do some quick math to figure out my mpg.

In mixed city/highway driving.. I get 27 to 28 mpg. About a 50/50 mix of highway and city.. this has been consistant from 90,000 miles up to the cars current 145,000

Highway, I once saw 36mpg during the worst of the gas price spike when I drove from NJ to DC and back and kept it exactly at 65mph with the windows barely cracked, sunroof "popped" at the back and the rear windows propped open. About as close to hypermiling as I get.

Usually it gets around 32mpg on strict highway driving.. but I am not a fast driver. I set the cruise for 70mph and just go.
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Old 12-14-2011, 08:42 PM   #7
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Mixed driving 70/30 (city/hwy) I usually get 26-28mpg. All hwy is around 32-33mpg. That's with a 5spd and 3.73 rear end. Those numbers are based on the OBC, I do keep track with a spread sheet too.

Edit - Oil is usually Mobil 1 10w-40 on 205/60-15 all seasons.
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Old 12-14-2011, 08:50 PM   #8
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would be interesting to know what oil and weight each user has in their car as oil weight can have an affect on MPG. Tires/wheels too..
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Old 12-14-2011, 08:57 PM   #9
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My "lifetime" average over the last several years of recording the mileage at each fill-up is right at 30 mpg. That's a mix of highway, city, autocross, AC, wide summer tires, narrower winter tires, etc. About the only constant has been oil weight at 5w30, but that's been several different brands of synthetic. For the OP, if you're not seeing at least high 20s on the highway then something's wrong.
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Old 12-15-2011, 01:17 AM   #10
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Quote:
Originally Posted by Zolf View Post
Man...those are some solid digits!!! You get 27-28 mpg combined and you say you get 32 mpg highway only. I...ehh....I, umm ehhh dont get it HOW? Please, do share. That's exactly how it should be!! Share share share.

I just bought new spark plugs (switching from Bosch to NGK), oil change, new oil filter and replacing air filter with K&N. I'll report back on fuel economy asap.
I am just not a fast driver, never have been. My thing was cornering. If I do not have to slow down, I do not have to accelerate
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Old 12-15-2011, 05:33 PM   #11
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Diclaimer:
Non hatchback content within, sorry.

Zolf, those numbers are really low.
My 93 325IS with 250,000 miles (origional M50TUB25 engine and Getrag 5 speed) consistently gets 27-28 MPG on the interstate (mixed between the mountains in VA / WV and the boring flat mid west) with mid grade (89 octane) fuel, cruising between 65 and 75 depending on traffic. I use Mobil 1 10W40 oil, and 225-45-R17 Bridgestone potenza Pole Position tires.

I'll report back when I have a ti.
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Old 12-15-2011, 06:07 PM   #12
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1998
342,000mi (550,000km)
10W-30
Manual

31-32mpg highway (@ 75mph)

To save fuel stick with the OEM rims and tire size. Don't accelerate fast. No AC, keep windows up. Also, consider tire diameter will alter odometer reading. Check your speedo against GPS and determine mileage offset.

Last edited by SSpeedracer; 12-15-2011 at 06:09 PM.
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Old 12-15-2011, 06:24 PM   #13
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I would check things like vacuum lines and maybe even the ICV, I've seen/ heard of those doing really weird unexpected things to performance when they wear out.
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Old 12-15-2011, 08:23 PM   #14
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That write up does not apply to you. The idle control valve on the M44 is right on the front of the throttle body. You only need to remove a couple of Torx bolts and unplug the harness connector to remove it. This is the thread you want for that:
http://www.318ti.org/forum/showthread.php?t=27697

How old are your o2 sensors? They can be worn out enough to cause mpg problems without turning on the check engine light. You can also change the oils in the transmission and differential to some nice synthetics and see gains, depending on what's in there.
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Old 12-15-2011, 08:54 PM   #15
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Yeah, general tune-up, fluid changes, and O2 are the first things to go after to improve your mileage.

Also, what kind of fuel do you get? Does it have a high ethanol content? Fuels are mixed considerably different between different countries and even different parts of the same country. I'm surprised people in the US are still seeing over 30mpg with almost all of our fuel being E10 now.
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