» Site Navigation | | » Recent Threads | | | 1999 M3 Swap 09-07-2023 10:10 PM 06-01-2024 03:04 PM 7 Replies, 409,841 Views | | My 318ti build 05-21-2024 04:48 PM 05-28-2024 06:42 PM 1 Replies, 3,632 Views | | OMG!OMG! 05-28-2024 08:53 AM 05-28-2024 08:53 AM 0 Replies, 1,446 Views | | | | | | 12-14-2011, 05:43 AM | #1 | Member Join Date: Dec 2011 Location: Helsinki Posts: 44 | 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. | | | 12-14-2011, 05:55 AM | #2 | Senior Member Join Date: Jun 2004 Location: Sydney, Australia Posts: 593 | 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. Last edited by RAiMA; 12-14-2011 at 06:01 AM. | | | 12-14-2011, 06:06 AM | #3 | Senior Member Join Date: Jul 2009 Location: MD/PA/DC Posts: 1,629 | 1996 Active, Auto. The OBC says 30-33 mpg depending on how much city driving I do. __________________ No more ti. | | | 12-14-2011, 07:24 AM | #4 | Senior Member Join Date: Nov 2004 Location: Minneapolis Posts: 1,587 | 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. | | | 12-14-2011, 12:59 PM | #5 | Senior Member Join Date: May 2011 Location: Philly Posts: 605 | 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 | | | 12-14-2011, 02:50 PM | #6 | Senior Member Join Date: Jun 2006 Location: SOUTH Jersey Posts: 1,085 | 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. | | | 12-14-2011, 08:42 PM | #7 | Senior Member Join Date: Apr 2007 Location: Elizabeth City, NC Posts: 3,877 | 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. __________________ ~Dave~ 98 328ti Morea Grun slicktop 11 128i space gray slicktop 13 JGC WK2 Deep Cherry Search | RealOEM Last edited by spidertri; 12-14-2011 at 09:43 PM. | | | 12-14-2011, 08:50 PM | #8 | Member Join Date: Dec 2011 Location: gilbert arizona Posts: 32 | 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.. | | | 12-14-2011, 08:57 PM | #9 | Senior Member Join Date: Jun 2003 Location: Halethorpe, MD Posts: 1,028 | 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. | | | 12-15-2011, 01:17 AM | #10 | Senior Member Join Date: Jun 2006 Location: SOUTH Jersey Posts: 1,085 | Quote: Originally Posted by Zolf 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 | | | 12-15-2011, 05:33 PM | #11 | Junior Member Join Date: Dec 2011 Location: Lexington, VA, USA Posts: 20 | 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. | | | 12-15-2011, 06:07 PM | #12 | Senior Member Join Date: Sep 2010 Location: Southern California Posts: 107 | 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. | | | 12-15-2011, 06:24 PM | #13 | Junior Member Join Date: Dec 2011 Location: Lexington, VA, USA Posts: 20 | 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. | | | 12-15-2011, 08:23 PM | #14 | Senior Member Join Date: Jun 2003 Location: Halethorpe, MD Posts: 1,028 | 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. | | | 12-15-2011, 08:54 PM | #15 | Senior Member Join Date: Aug 2005 Location: Florida Posts: 2,525 | 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. | | | | | Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | | Posting Rules | You may not post new threads You may not post replies You may not post attachments You may not edit your posts HTML code is Off | | | |