Gas Mileage Question/Survey

[e30pq]

S50
Getrag 260
4:10 LSD
225/50/15's

I just installed a new E36 O2 sensor. I was running the M20 O2 sensor over the last year. I recently took the car to get smogged and it didn't pass. With the correct O2 sensor and new plugs the car runs awesome and passed smog.

I drove thru 1/2 tank getting my cat hot prior to the smog inspection. I kept the car at 4k rpm for about one hour prior to the smog test. The remaing 1/2 tank was city driving with my foot in it. I got 18mpg on that tank.

I just topped off my tank (5 gallons) city driving with my foot in it and got 24mpg.

I assume it would do a little better on the highway. I have a 3:73 lsd going into the car very soon.

[equate975]

s52 obdi
3.25

17 if I am lucky. average 240 a tank. Thats mixed. I don't take it on the highway much so I don't know what it gets on pure highway.

[Justin B]

im referring to ppl who quoted their mileage at above 30mpg after doing 24v swap, who im assuming read their mileage off the OBC which is never correct to begin with...sarcasm

FWIW - my obc, with a mark d chip, and 95 m3 injectors (have yet to put my m30 afm on yet), read within one MPG of my actual mileage actually underestimating by one on both fill ups coming back form Bfest. Of course this is after converting it from *L/100KM since the button to change it seems to be broken on mine, but ehh..

Back to 24v discussions :P

[Mr.SWISS]

M50 non vanos
E36 trans that came with
S3.25 diff
17ish city, 23-25 highway, 17ish
I have never drove batshitinsanecrazyzomgwtfbbqnoR3Vlimit for a tank.

[grib]

didnt you get pissed when you first figured it out after seeing ppl quote their damn 30+mpg OBC mileage?? hahahaha

+1

S52 OBD-1, handful of mods
ZF320
3.23
City: 19mpg
Highway ME: 24 -
Highway HER: 26 +
Batshit is about the same as my city.

Also note that it's a cabrio - so a little heavier than most of your cars. ;)

[Stu]

stu what rear end you using?

3.73, same gearing as stock e30 325i

[windsor318is]

stu what rear end you using?

[Stu]

im referring to ppl who quoted their mileage at above 30mpg after doing 24v swap, who im assuming read their mileage off the OBC which is never correct to begin with...sarcasm

oh.

Mine does over 30 on the highway, fo real.

[golde30]

im referring to ppl who quoted their mileage at above 30mpg after doing 24v swap, who im assuming read their mileage off the OBC which is never correct to begin with...sarcasm

[Stu]

what do you guys mean about the OBC gauge? I assume this is a 325i/M3 thing....does the stock OBC not read mileage correctly with the swap?

What actual highway mileage do you guys get? (at 70ish mph)

[MR 325]

im rite about there too. didnt you get pissed when you first figured it out after seeing ppl quote their damn 30+mpg OBC mileage?? hahahaha

Yeah, a little disappointing but it's ok. Still much better than my turbo car.

[golde30]

S50
E30 Getrag
3.73
Chip

I've only actually kept track for one tank but with my mostly city driving, some freeway and some hard driving I averaged 19mpg for the tank.

im rite about there too. didnt you get pissed when you first figured it out after seeing ppl quote their damn 30+mpg OBC mileage?? hahahaha

[e30polak]

obd1 s52
e36 ZF
3.25 lsd
215/45/17

City: 17-20 (depending on the traffic: LA sucks)
Highway: 25-30 (between 65-90)
Batshit: probably 12-15 (WOT FTW!!!)

[Stu]

3.0/getrag 260/3.73
tall tires (205/60/15) with 42psi

city: 20-22
highway: 30-32
batshit: 15-18 (guess)

[MR 325]

S50
E30 Getrag
3.73
Chip

I've only actually kept track for one tank but with my mostly city driving, some freeway and some hard driving I averaged 19mpg for the tank.