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Old 07-30-2011, 10:15 PM   #1
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Boxster MPG

So i am wondering what everyone gets MPG wise in their boxsters. I calculate mine when i fill my tank to full, number of gallons i put in, and divide the number of miles ive driven since last fill up by those gallons.


1999 2.5l 5-speed

My best mpg was 23
and my worst was 18
these are for nearly full tanks

i typically get 19-20 mpg anymore.
Am i getting low gas mileage? I drive very conservatively most of the time.
Any suggestions? maybe something isnt working right?

Also just curious what you guys are getting in various years and models

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Old 07-30-2011, 10:23 PM   #2
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2000 boxster 2.5.......consistantly at 20.1 mpg
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Old 07-30-2011, 10:59 PM   #3
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2000 Boxster base, 2.7L 76K miles
I'm checking my MPG just like you.. every time I fill up, I pull my phone to do the calculations
I was getting 16-18mpg, and I drive about 40/60 city/HWY.
For last 2 tanks I'm up to about 20mpg thanks to technotorque, but then again.. I cruise at over 3K rpms

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Old 07-31-2011, 04:45 AM   #4
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on long trips (on the highway full time) i get 24, otherwise i get around 19 mixed driving (and i don't necessarily drive "conservatively," so punch it more... )
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Old 07-31-2011, 05:20 AM   #5
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2006 Boxster S (pushing 43,000 miles now!)
Spirited country roads I get low-low 20's.
Highway cruising I get over 28.
I'm never in city stop & go traffic.
99.99% top down.
I exclusively purchase 93 octane without ethanol. Makes a HUGE difference.

Last edited by Flavor 987S; 08-01-2011 at 07:47 AM.
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Old 07-31-2011, 07:37 AM   #6
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25 miles/US gal on highway driving, using 94 octane
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Old 07-31-2011, 07:48 AM   #7
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03 Boxster S

Best 26.8 highway
Overall, about 21
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Old 07-31-2011, 08:31 AM   #8
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According to my OBC hack, my 2002 2.7 averages 24-25mpg with mixed driving on most tanks. I have seen as low as 17mpg with harder driving and as high as 31mpg on long freeway trips. I always use premium but we also have a mandated 10% ethanol which is said to reduce mileage so my mileage could be even better.
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Old 07-31-2011, 09:51 AM   #9
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Quote:
Originally Posted by MN 986
I always use premium but we also have a mandated 10% ethanol which is said to reduce mileage so my mileage could be even better.

There is a TON of ethanol free gas your great State of Minn. You just have to know where to look. IMHO, 91 pure gas is better than 93 with ethanol:

http://pure-gas.org/index.jsp?stateprov=MN
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Old 07-31-2011, 04:58 PM   #10
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2001, 28 highway, 21 around town, I like to floor it often. 93 Octane BP with 10% ethanol.
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Old 07-31-2011, 05:57 PM   #11
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top down, highway @ 70mph.ish 25mpg
top up, highway @ 70mph.ish 28mpg
around town and what not, 21mpg

2001 boxster s 6-speed
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Old 07-31-2011, 06:23 PM   #12
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97 with about 44k, haven't done my calculations as frequently, but I usually try to fill up at about 1/4 tank, so out of the 3/4 or so that I do go through I've seen anywhere from 19-23mpg, depending on how much of it is highway, which isn't much unless I'm taking the car out for a run or have a trip with a good length of highway involved, otherwise it's mostly city and local turnpike driving, coupled with ethanol everywhere, so my mileage isn't great...plus I'm not nice to it once it warms up.
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Old 07-31-2011, 09:13 PM   #13
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I've got a 2.7l Tip - average about 17.75mpg.... but then it's normally fast highway driving, cruise at about 4k+rpm...

Would be interested to see what other tiptronic boxsters are getting...
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Old 07-31-2011, 09:26 PM   #14
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I buy alcohol free 91 octane gas.

My 1998 2.5 5 speed got 24-26 around town and 30-33 on the road trips. I whaled on her often.

My 2000 S 6 speed gets 20-22 around town and 25-28 on road trips. Oh yes, I whale on her often too.
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Old 08-01-2011, 07:03 AM   #15
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I have an 08 base Cayman (2.7L). I just took a 400 mile road trip; averaged 26.5 mpg at 60-70 mph speeds with some city driving. Nearly finished the whole trip on one tank. Not bad. In just urban driving, I usually get 23-24 mpg.
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Old 08-01-2011, 08:41 AM   #16
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Mine got 18 MPG regular driving
20 MPG Highway.

I got 2.7 l, 2002 Tip with 74k mi.
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Old 08-01-2011, 11:07 AM   #17
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Quote:
Originally Posted by matty-matt
top down, highway @ 70mph.ish 25mpg
top up, highway @ 70mph.ish 28mpg
around town and what not, 21mpg

2001 boxster s 6-speed



Wow! 450 miles per tank on the highway!

I've never gotten much over 360-375 miles in a tank (23.5 mpg). I click the mileage reset after every fill up and generally put in 16 gallons every time. I've never, ever, reached 400 miles. I can't imagine averaging 450 miles.

I have noticed a big difference with the top off. Definitely lose a few miles per gallon.

I generally get 325 miles per tank (20.3 mpg) in mixed highway/city (top up/top down) driving.
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Old 08-01-2011, 11:55 AM   #18
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the furthest i've ever pushed it was 400 miles and i was sweating bullets (mostly because i turned the a/c off at the end) when i finally found a gas station.

i guess theoretically you can get 450 miles on a tank. that comes out to around 26.6 mpg using every last drop...
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Old 08-01-2011, 01:28 PM   #19
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I figure efficiency improved as the years progressed even with the increases in horsepower, but if I remember right the sticker on the car said 24 or 26 highway during the first years of the car. I never expect to get sticker estimates, so I'm happy so long as it's in the 20s. I don't know how some people are getting that good mileage unless you're really cruising at the speed limit in top gear, which I'd love to do if the engine didn't apparently dislike it so much.
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Old 08-01-2011, 01:39 PM   #20
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Boxster 2.5 w tiptronic, ECU is tuned/remapped

I get 21-22mpg mixed driving. Around 24mpg highway.

Before the tuning I got 18-19mpg


Getting a remap is the best performance mod done so far, better fuel economy and more power!

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