How To Increase The Mpg Most Efficiently - BMW Forum - BimmerWerkz.com
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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#1 (permalink) Old 10-21-2004, 05:51 PM
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hi,
i am trying to figure out some detailed ways to increase the MPG in my 325i. i want to do a "project" to find out combination of different things so that the AVERAGE MPG (50% freeway at 70mph and 50% city driving) would be more than 27 miles per galon.

by the way, how reliable is that built-in computer MPG meter???

i realize that the actual driving habits make a lot of difference, but what effects would different air filters, co2 ratios, oxygen sensor, minor tuneups, mechanical tuneups have on the mileage?


<span style='font-size:13pt;line-height:100%'><span style='font-family:Arial'>'87 325i Convertible</span></span>
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#2 (permalink) Old 10-21-2004, 06:31 PM
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I don't think my economy meter is reliable at all. I can downshift from fourth to third (1500 -> 2200) at about 35 miles per hour, and the needle hardly moves. It does, however, jump considerably if I push the gas down, even if my speed or revolutions don't budge. Like, going uphill.


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#3 (permalink) Old 10-21-2004, 06:36 PM
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drive slower! i average 20-22 and i have my foot on it Most of the time...but if i let off a bit im in the 27-33 range. just start slower/smoother and dont floor it, and you will be amazed how much gas u can save...

Mark
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#4 (permalink) Old 10-21-2004, 07:54 PM
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Quote:
Originally posted by Speedy-325is@Oct 21 2004, 03:36 PM
drive slower! i average 20-22 and i have my foot on it Most of the time...but if i let off a bit im in the 27-33 range. just start slower/smoother and dont floor it, and you will be amazed how much gas u can save...

Mark
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#5 (permalink) Old 10-21-2004, 08:43 PM
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AMEN!


hey, u need any parts fo yo car???? i have tons of them.

Mark
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#6 (permalink) Old 10-21-2004, 09:26 PM
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New Air Fiter
Coil
Plugs
O2 sensor
fuel filter
low idle control
cap and router

those will all help signifaganly

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#7 (permalink) Old 10-22-2004, 07:41 AM
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I had a E30 316i auto and the auto added 20% to fuel consumption. To improve the fuel economy I sold the car and got a E46 328i Manual which gives me better fuel economy and 0-60 in 6.7 seconds. I cannot complain at that.
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#8 (permalink) Old 10-22-2004, 02:11 PM
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chage the driving habits.

I noticed that if I(318i) speed up really fast, to 60-70 i get the best MPG.

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#9 (permalink) Old 10-22-2004, 02:16 PM
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Quote:
Originally posted by Aether@Oct 21 2004, 04:31 PM
I don't think my economy meter is reliable at all. I can downshift from fourth to third (1500 -> 2200) at about 35 miles per hour, and the needle hardly moves. It does, however, jump considerably if I push the gas down, even if my speed or revolutions don't budge. Like, going uphill.
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when u are shifting down, and not pressing gas, u are not using any more gas then u did. with 4th
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#10 (permalink) Old 10-22-2004, 03:48 PM
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It's using more gas when it escalates 700 rpm.


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#11 (permalink) Old 10-22-2004, 07:38 PM
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yep, driving habits help a lot to increase the mpg (even though its nice to rev it up sometimes, good for the engine too )

what about the COIL and DISTRIBUTOR CAP, if you get new ones does it really help a lot or your car just runs smoother?

<span style='font-size:13pt;line-height:100%'><span style='font-family:Arial'>'87 325i Convertible</span></span>
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#12 (permalink) Old 10-22-2004, 10:00 PM
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i heard that driving at 55mph is the most effeciant speed to drive at while on the highway. i have an 87 325 i can get 350miles to a tank of gas, providing that it is all highway miles. 260miles in stop and go taffic.
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#13 (permalink) Old 10-22-2004, 10:20 PM
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Quote:
Originally posted by javieruz@Oct 22 2004, 05:38 PM
what about the COIL and DISTRIBUTOR CAP, if you get new ones does it really help a lot or your car just runs smoother?
[snapback]216356[/snapback]
It's all part of a cleaner fuel system. If your ignition components are doing their job as best they can, then it just makes sense that your gas will burn better and your timing will be more precise, thus creating more efficiency. Your spark plugs, injectors, and fuel lines are also good things to consider when cleaning out your delivery system.


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#14 (permalink) Old 10-23-2004, 02:15 PM
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Quote:
Originally posted by viali8@Oct 22 2004, 08:00 PM
i heard that driving at 55mph is the most effeciant speed to drive at while on the highway. i have an 87 325 i can get 350miles to a tank of gas, providing that it is all highway miles. 260miles in stop and go taffic.
[snapback]216442[/snapback]
hmmm interesting, i noticed that my 87 325i gets only about 200 miles on a full tank in city, and about 260 on mostly highway....

<span style='font-size:13pt;line-height:100%'><span style='font-family:Arial'>'87 325i Convertible</span></span>
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#15 (permalink) Old 10-23-2004, 02:20 PM
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Quote:
Originally posted by javieruz+Oct 23 2004, 12:15 PM--><div class='quotetop'>QUOTE(javieruz @ Oct 23 2004, 12:15 PM)</div><div class='quotemain'><!--QuoteBegin-viali8@Oct 22 2004, 08:00 PM
i heard that driving at 55mph is the most effeciant speed to drive at while on the highway. i have an 87 325 i can get 350miles to a tank of gas, providing that it is all highway miles. 260miles in stop and go taffic.
[snapback]216442[/snapback]
hmmm interesting, i noticed that my 87 325i gets only about 200 miles on a full tank in city, and about 260 on mostly highway....
[snapback]216752[/snapback]
[/b][/quote]

My car is an 87 325 eta. it was built for effeciency. My car also only redlines at 4500rpm's
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