M52 + 6sp + 3.15 = 33mpg

[evoe46m3]

I averaged 31-32 driving from Seattle to Dallas using an s50+g260+2.79. according to my odometer I did 33 to 34 but my tires are slightly undersized. We checked my odometer against the mile markers and it was optimistic 0.1 miles per mile traveled. we went 75-80 the whole time.

[straight6pwr]

Any of you 30+ guys using a GPS for miles traveled numbers? Why are my calculations slightly better than the original spec'd EPA rating (19/25) vs. ridiculously beyond? You guys are either running rubber that is well short of the factory rolling diameter or burning dangerously lean. I'm not trying to be a dick here but 37 mpg's from a 24v BMW 6 cyl/4.10 diff. is not real unless you were driving downhill the entire fucking tank.

My m42 is well sorted, and I don't drive like an asshole btw.

i agree, those are some lofty claims.

[dinanm3atl]

Some of those seem incorrect but mine? Lower gear than stock. Overdrive in the trans. Less weight. Rolling on 195.65.14 tires.

I could always do better than EPA on all my E36 m3s. Consider a lot of new cars also beat the EPA... it's the EPA. They are worthless and use a computer to tell us how many MPGs the car will get... without driving it and finding out.

[Ryann]

Less weight. Rolling on 195.65.14 tires.

Sounds like you had plenty of weight aboard. And you're not running the same wheel/tire package as the one in your sig?

I could always do better than EPA on all my E36 m3s. Consider a lot of new cars also beat the EPA... it's the EPA. They are worthless and use a computer to tell us how many MPGs the car will get... without driving it and finding out.

Agreed, I've found most vehicles will do a couple mpgs over the EPA rating. But you guys are talking about 8-12mpg over the EPA rating.

I think there are a lot of people taking OBC information at face value here vs. calculating their actual fuel economy.

[Civilian]

Sounds like you had plenty of weight aboard. And you're not running the same wheel/tire package as the one in your sig?

He's talking about a different car, That 88 is his old one.

[Bimmerman325i]

Agreed, I've found most vehicles will do a couple mpgs over the EPA rating. But you guys are talking about 8-12mpg over the EPA rating.

I think there are a lot of people taking OBC information at face value here vs. calculating their actual fuel economy.

Then please explain how it took 14 gallons to fill up after driving 460 miles according to GPS and Google?

Yea, that's 33mpg.

[Ryann]

Then please explain how it took 14 gallons to fill up after driving 460 miles according to GPS and Google?

Yea, that's 33mpg.

I can't explain it, which is why I feel like some of these claims are either exaggerated or miscalculated. No offense.

[nando]

Sounds like you had plenty of weight aboard. And you're not running the same wheel/tire package as the one in your sig?



Agreed, I've found most vehicles will do a couple mpgs over the EPA rating. But you guys are talking about 8-12mpg over the EPA rating.

I think there are a lot of people taking OBC information at face value here vs. calculating their actual fuel economy.

Are you looking at the bs "updated" epa figures, where they came up with a magic formula to recalculate the original figures? Because the original figures were close, but they got too many complaints from todays moronic drivers who do all sorts of stupid shit and couldnt match them.

Also, where is everyone getting that the obc is inaccurate? People say it all the time, but in stock form its amazingly accurate. What are these claims based on?

As far as tires, youre talking about a 2% difference at most.

[Bimmerman325i]

Also, where is everyone getting that the obc is inaccurate? People say it all the time, but in stock form its amazingly accurate. What are these claims based on?

This. Using near-stock OD diameter tires, I've always been dead on (+/-1mpg) with OBC mpg vs real mpg in my E30 and E36.

[Bimmerman325i]

I can't explain it, which is why I feel like some of these claims are either exaggerated or miscalculated. No offense.

I know what I drove. I filled up in Ticaboo, UT, and drove straight to Boulder, CO. 14 gallons to fill up an e36 325i after a bit over 460 miles door to door, no intermediate fill-ups.

You're free to not believe me, I'll keep enjoying my good mpg anyway.

[Lodsin]

I know what I drove. I filled up in Ticaboo, UT, and drove straight to Boulder, CO. 14 gallons to fill up an e36 325i after a bit over 460 miles door to door, no intermediate fill-ups.

You're free to not believe me, I'll keep enjoying my good mpg anyway.

Your e36 numbers seem accurate but 27 mpg in an e30 with i motor? Were you being toed? I get like 19-22mpg w/M20b25.

[Bimmerman325i]

Your e36 numbers seem accurate but 27 mpg in an e30 with i motor? Were you being toed? I get like 19-22mpg w/M20b25.

No, that was highway only, same as the E36 numbers. Average in that car was around 21-23mpg combined.

[Ryann]

Are you looking at the bs "updated" epa figures, where they came up with a magic formula to recalculate the original figures?

Honestly? Yes. Substantiate your claim that the new formula is somehow flawed.

Also, where is everyone getting that the obc is inaccurate?

The OBC, like the ODO, is only accurate if you are running tire sizes that are equal in diameter to stock specs. What percentage of claimed 30+mpg cars in this thread are running stock diameter packages? I don't know.

As far as tires, youre talking about a 2% difference at most.

My package? 3.8% to be exact, and accounted for in my mpg calculation.

[lambo]

So I have 185/65's, when I should have 195/65's, on my bcaps and by odo readings I get around 28.5 mpg. I did the math, and rolling on undersized tires creates a discrepancy of around .62 mpg...this is according to the odo though, which may not be too awfully accurate to begin with.

[Bimmerman325i]

My package? 3.8% to be exact, and accounted for in my mpg calculation.

3.8% difference in OD is equivalent to 1.14mpg difference at 30mpg. Not substantive enough to throw off the results.

FWIW, all cars I've mentioned were on stock OD tires, and the OBC matched what my calculated measured distance/gallons filled with maybe .5mpg difference.

E30s came stock with 195/60/14 and 195/65/14 tires, which makes almost no difference to mpg calcs, OBC or otherwise.