I just got done with a 600 mile trip and averaged about 33 mpg (according to my OBC). I thought this was pretty awesome considering I have a 325i cabrio with 4.10 diff. I run redline tranny/diff fluid and mobile 1 synthetic engine oil. Also I was going about 60 the whole way :)
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Avgd 33 mpg on my 325i
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Avgd 33 mpg on my 325i
Renting my rear wheel bearing tool kit. SIR
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Yeah stock wheels pumped to 34 psi front and 38 psi rear. I had my hardtop on and it was loaded to the brim with all my shit too. I'll have to post pics later.Renting my rear wheel bearing tool kit. SIR
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I thought that a 2.93:1 rear diff would boost my MPG...nope worse by about 5 mpg, I am thinking that it put the engine out of the powerband and tit wold have to really work hard to get back to the torque peak, whereas the 4.10 puts the motor in powerband and needs less gas to maintain monentium. I think a 3.73 is the best for MPG, of course I like acceleration. Now I am babbling. Best I ever got was 31 and was coasting a lot.
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I have to question the numbers your OBC is giving you. Instead, calculate the total amount of fuel used divided by the number of miles driven. During the early part of this year I had to de-tune my E30 some since the job I've been doing requires a lot of driving (and I've been documenting every mile and every trip to the fuel pump for next years' income tax purposes). Here's a breakdown of my set up....
Car: 1991 325i, 2 door, 5 speed
Odometer: 200,141 (as of 8/1/08 )
Motor: completely stock including stock chip
Differential: 3.73 limited slip
Wheels: 15x7 Racing Dynamics
Tires: 225/50 Falken Ziex
Tire Pressures: 34psi at all corners
Suspension: B-Sports, IE Stage 3 springs, stock sways, no camber plates
Full interior, A/C, spare tire, etc. but nothing else in my car (I'm a neat freak)
Average fuel economy (mixed): 26.1 mpg
Average highway: 27.8 mpg
Average city: 24.0 mpg
Calculated total miles from 16 gallon tank: approx. 410 with a small reserve
With the increase in fuel prices, I've made some adjustments to my driving style to maximize my fuel economy. I typically drive 65-70 and the freeway and keeping things sedate when on surface streets. Also using 87 octane fuel exclusively.
JonRides...
1991 325i - sold :(
2004 2WD Frontier King Cab
RIP #17 Jules Bianchi
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Originally posted by Jon325i View PostCar: 1991 325i, 2 door, 5 speed
Odometer: 200,141 (as of 8/1/08 )
Motor: completely stock including stock chip
Differential: 3.73 limited slip
Wheels: 15x7 Racing Dynamics
Tires: 225/50 Falken Ziex
Tire Pressures: 34psi at all corners
Suspension: B-Sports, IE Stage 3 springs, stock sways, no camber plates
Full interior, A/C, spare tire, etc. but nothing else in my car (I'm a neat freak)
Average fuel economy (mixed): 26.1 mpg
Average highway: 27.8 mpg
Average city: 24.0 mpg
Calculated total miles from 16 gallon tank: approx. 410 with a small reserve
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Originally posted by Bimmerista View PostBack in Dallas??
Granted my calculations weren't precise. But I did notice my OBC reading went down to 28mpg when I sped up to 65. So I was reving at 3k instead of 2.5k (when cruising at 60) If I do another road trip, I'll come up with more precise numbers.Last edited by ///M42 sport; 08-01-2008, 03:09 PM.Renting my rear wheel bearing tool kit. SIR
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