My M30 gas milage...

[dlmpsy]

I consistently get 27 mpg in my '90 325is 5 speed. It has no cat, headers, chip, cone filter and synthetic oil (motor, tranny & diff.). I use premium fuel.

[euroshark]

You mean B32 or B35?

No, I meant B34 or B35. Most people don't use the B32 in their M30 swaps because 3.2 liters isn't enough for an E30... Nevermind that the motor came in E28s and they ran great... The B34 is the 3430cc M30 that they used from ~1982 to ~1988, the B35 came after that with higher compression, different head (with fully hemispherical combustion chambers), larger valves, blah blah blah and made 208-211hp depending on the source, instead of the B34 (US Spec) 185hp.

/school

[tonytony]

when i had the m20 i was doing about 23-25 mpg hwy, now i'm getting about 30mpg with the m50nv

[ptownTSI]

I decided to see what the *best* MPG I could out of my m30 motor in my e30.

No so good! With mixed city highway driving I only got 16.9 MPG. That was with keeping the revs low, lots of coasting, and very, very easy accelarations.

This week, I'm going to see what the *worst* MPG I can get. I'll keep the same mixed city/highway driving that I do every week, But this time I'm going to rev the hell out of the fucker and goose it as often as I can. Anyone care to guess what I'll get?

...

and everyone thought my 1960's technology 5.9L pushrod v8 in my jeep was soooo bad for only getting 14-15avg and 20 on the freeway.

[92 mtechnic cabrio]

I get 24 - 25mpg on OR off the freeway.

But I do my best to save fuel. Anticipate traffic lights, keep the car clean and empty, clearing out useless crap, drive behind big trucks...

[Ablice]

To the people running M30s, are they B34s or B35s?

You mean B32 or B35?

My POS eta got a average of around 21-23 in town, about 28 highway, with the exception of a high of 35 mpg. The 325is got a best overall of 26.7mpg (crusin' back roads in nuetral and 5th) but overall now is from 22 to 26 mpg. Right now it says 24.5.

I'll have to check out the trip meter readings for the next 2 tanks though.

[euroshark]

To the people running M30s, are they B34s or B35s?

My dads M90 (early euro 3.5, overbored etc) gets 22mpg on the highway and about 20 in the city.... 3.07 diff.

But my B32 with bigger injectors and higher fuel pressure than stock gets 26 to 27 COMBINED in my 3250lb E28 body with 3.46 gears. Damn, can there really be that big of a difference?? The B32 has a 272 cam compared to the US spec 3.4s 260cam, and you have to rev the thing to move as fast as a 3.4. My Euro 6 series had an M90 3.5 like my dads, with the same AFM and ECU ( 008 ) as my 5 series, and it got about 24mpg combined with a 3.25LSD.

This is pretty interesting... I'll be sure to post what I get in my 335i with the euro 3.5 and 3.25LSD.

[Sean]

I've been gettin around 15-17 in town. And, on the highway, I get around 20-21. lol I like to keep my car above 100 - so I'm pretty sure that has something to do with it.

[Garageaholic]

My M30 engine on my 335i gets about 20 highway
My 325e got an all time high of 33.1mpg highway

[golde30]

for the guys saying m20's should be getting in the 20's constantly...try living in a city that is all hills, has a stop sign or traffic signal on every fuckin block, stop n go traffic on all freeways, then tell me what kinda MPG yer getting... i gaurantee it will be shitty like 16city/20highway...

[backtrail69]

I get about 25 mpg city/highway in my eta and like 29ish all freeway. :) Still chirps the 215s going into 2nd :P. My turbo gets about... 18 on the freeway and like 15 around town.

[Jean]

Lol, just for shits and giggles in my previous daily/autox car 04 r32, the best mileage I could get was about 21-22mpg mixed driving...and the worst.... about 10-12mpg on the track heh.

[george graves]

UPDATE: Just pulled a 700 mile trip - OBC says 27.8 MPG - just FYI

[PeaveyBassist]

My constant highway driving gets me around 24mpg. BUT I drive about 95mph for about one full hour straight. At least 85mph for about 2 hrs and about 70 for one hour. Also haul balls for about 20-30 miles all on one tank. This is what happens when you drive one hour to work and back at night every day of the week ;) If I hang around 70mph for all the highway driving and baby it for those 20-30 miles in town driving, I get around 26-28mpg on my m20b25 with 167k miles.

Will

[Joe318is]

i drove a 88 m3 out to NY earlier this year. when i drove out on the freeway the car was gettng about 25 or 26 mpg! But if you switch the OBC over to the other mpg setting [only reads when the car is rolling] then it was getting 36mpg :shock: [yeah, 17yo OBC cant be too accurate]