Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Recommended Posts

    You can remove these ads by becoming a Contributing Member.

From a Brit point of view we would consider that a bit low, but when you consider your gallons are smaller than ours and i assume you are talking American gallons i dont think that is a dissapointing figure.

Especially when we Brits know all of you are on the large size ;)

And you were probably carrying your lunch with you :clapping:

Link to post
Share on other sites

I've got the exact same 2000 Boxster S (in Canada) with 37,500 mi and my car gets 26mpg at best. When I'm messing around in the city (i.e bouncing off the rev limiter I get about 18mpg) Like the old story goes, you have to pay the cost to be the boss.

An S2000 would have had much greater reliability and fuel economy, but at the end of the day you'd be driving a Honda, just like your neighbors in their Odyssey and 5 kids.

Link to post
Share on other sites
Help.

2000 Boxster S manuel with 70,000 miles.

Steady freeway driving 67 mph without traffic. I could only getting 23.5 mpg.

Is my car something wrong?

It seems to be slightly on the low side, but nothing out of the ordinary. What is important though, is that you should monitor your fuel consumption as it is a good indicator that there is something that should be attended to if it changes drastically from what you have now.

Regards, Maurice.

Link to post
Share on other sites

Appears to be acceptable. 23.5 MPG is about 9.877 km/L (10.13 L/100 km). Even with average cars like an A4 1.8 automatic or a Galant 2.5 V6, I could only manage max of 12.5 km/L (29.7 MPG) on a long drive. Remember that your car is not necessarily a featherweight, and it does have 6 cylinders.

Do you drive with the air conditioning always on? That can increase fuel consumption by as much as 20%. On the Audi and Galant, my average consumption for a week's combined city/motorway commute of 8.5-9 km/L (20.2-21.4 MPG) can drop down to 7-7.5 km/L (16.6-17.8 MPG) just by using the aircon constantly. Fortunately here in NZ, often you can get away with not using the air conditioner, I only use it when it rains (to defog), blistering heat after getting into the parked car, or at least 10 minutes every month including winter, just to keep the compressor lubricated. At times I will run the aircon for 5 minutes then off for the next 10.

Link to post
Share on other sites
Fortunately here in NZ, often you can get away with not using the air conditioner, I only use it when it rains (to defog), blistering heat after getting into the parked car, or at least 10 minutes every month including winter, just to keep the compressor lubricated. At times I will run the aircon for 5 minutes then off for the next 10.

Invaluable advice for keeping the seals in the air conditioning system lubricated. Best insurance to avoid costly a/c repairs.

Regards, Maurice.

Link to post
Share on other sites
Fortunately here in NZ, often you can get away with not using the air conditioner, I only use it when it rains (to defog), blistering heat after getting into the parked car, or at least 10 minutes every month including winter, just to keep the compressor lubricated. At times I will run the aircon for 5 minutes then off for the next 10.

Invaluable advice for keeping the seals in the air conditioning system lubricated. Best insurance to avoid costly a/c repairs.

Regards, Maurice.

I would agree, but don't forget, whenever you turn on your front defroster, the A/C turns on automatically.

Link to post
Share on other sites
Crystal, I see you are in Cali. Do you run 91 or 93 octane? If you are only able to get 91 this could be "costing" you 1-2 MPG's too. Just a thought.

Hadn't thought about that, but I agree. No Boxster experience on 91. But Mrs Sixter's new X5 got 1-2 mpg less on 91 during Thanksgiving trip to NorCal. It also lost power that was especially noticeable going uphill. The transmission downshifted as many as two gears on hills that it held in 6th gear on 93.

Link to post
Share on other sites

All of the posts have been quite interesting - as I have recently been tracking my gas mileage using lower (cheaper) mid-octane fuel. I am not recommending this to anyone, but as for me, the change has been quite surprising, probably due to oddities in the fuel system (timing?) unique to my car.

Anyway I have a '99 non-s and have historically gotten around 21-22 all 'round mpg. The car has also had rather poorer acceleration at proper running temperature, a bit better when the engine was cold/warming. No dyno tests, just seat of the pants observation.

With recent high gas prices, I figured what the heck - let's try a lower octane fuel. Another change which coincidentally has appeared at most all of the stations in the area at the same time, is a switch to a 7pct ethanol fuel mix. To my surprise I now get 24.5 mpg and better acceleration at proper running temp. No downside as far as I can tell. I can't really guess why, but imagine there may be some oddities in the engine timing or operation of the fuel injectors which as a whole work out pretty well.

As for my around town driving habits they are quite boring about 95 pct of the time - above average use of cruise around town, like to keep rpms high until cruising, put the thing in neutral and coast at the mere suggestion of a red light somewhere ahead. The other 5 pct though... is pure fun!

FYI the most recent Porsche Parade magazine has a very good article describing the use of ethanol-mix fuels.

Link to post
Share on other sites

In my 2000 non-S Boxster, I used to get around 28 on the highway and 19-20 in town. This was using 93 octane fuel. I've never used anything lower than 93. I would guess you'd get slightly better in the S, but you do have a bit more weight which may negate that.

Currently in my Boxster, I get about 22 in town (18-19 if I've been playing) and right around 30 on the highway. However, this is with a 3.4l Carrera motor from a 996. YMMV

-Michael

Link to post
Share on other sites
Guest carpediemgr

Hi and happy new year to all

Michael from Athens Greece own 2.5 boxster with 43000 km

9.8 L/100km in highway using 4 and 5 gear and accelerate to floor

18 -30 l/100 km in the city of athens need many times to stay 5 minutes without moving a step ahead :)

lucky Europeans :) i use 100 octane superunleaded casoline lol the power of 100 octane make the car more economic because of the better acceleration

thanks michael

Link to post
Share on other sites
Help.

2000 Boxster S manuel with 70,000 miles.

Steady freeway driving 67 mph without traffic. I could only getting 23.5 mpg.

Is my car something wrong?

Hi Crystal,

I'm just inland and south of you in Temecula. I drive a 2003 Boxster, manual, with 107,000 miles. I've driven the car since it was new off the lot with 17 miles. I know many people have a fluctuation in mileage, however, I drive to San Diego daily without traffic at about 75-80 and I ~29 mpg. As a matter of fact, I drive on the freeway so much that I've never even done rear brakes to my Boxster yet. I follow the Porsche maintenance schedule for all other service. I drive in the morning with the top up and generally with the top down in the afternoon. Based on information from http://www.fueleconomy.gov/feg/maintain.shtml, if you have a dirty air filter, that could cause a degradation to your fuel economy by up to 10%, low tire pressure could impact your mileage up to 3%, and the incorrect viscosity engine oil could cause further degradation of 1-3%. I know my mileage is accurate as I calculate it at almost every fill up. Seems low to me based on your driving habits.

Good luck! Every improvement helps these days with the cost of gasoiline.

Best regards,

Bill

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.