10-19-2007, 08:57 AM
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#1
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Registered User
Join Date: Jul 2006
Location: Virginia
Posts: 916
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Absolute Worst Gas Mileage?
I have seen where folks are getting some pretty good mileage with their boxsters, in the low 30mpg-range with highway driving, especially with the 2.5L engines. I am interested on what the absolute worst mileage you may have gotten on a tank of gas, not counting tracking or racing the car.
I just went through a tank of gas mostly city and backroad spirited driving. If my calculations are correct, I only got 15.3 mpg, which is an all-time low for me. I don't remember for sure, but something like 16-17 mpg was my previous low for mileage. I think I have a long road trip comming up next week (1,600 miles), I will take it easy and see what I can get on the highway.
Ed
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My Car Webpage
2000 2.7L Boxster 102K; TTP intake, headers, high-flow cats; Dansk high-flow muffler; Autothority ECU chip; TechnoTorque 2; Bilstein coilovers; Racing Dynamics strut brace; stress-bar suspension kit; Aasco lightweight flywheel, B&M short shiftkit; 18" wheels; spare tire delete; OEM GT3 seats; JL audio speakers and subwoofer; Alpine PDX-5/PDX-2 amps; Kenwood DNX8120 CD/DVD/Nav; litronics, deambered
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10-19-2007, 09:00 AM
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#2
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Registered User
Join Date: Mar 2006
Location: Pennsylvania
Posts: 15
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Ed,
I average around 24 mpg. in my 05 2.7L no matter the driving style.
Kim
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10-19-2007, 09:11 AM
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#3
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Registered User
Join Date: Sep 2006
Location: chicago
Posts: 3,510
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yeah, i take it easy.
__________________
http://i34.tinypic.com/157yslk.jpg
"I couldn't find the sports car of my dreams, so I built it myself." ~F. Porsche
Gemballa springs::litronics::Eurotech 18s(275/225)::B&M::MOMO wheel::
exhaust cutouts::EVOcoldair intake::OEM smoked tails & sidemarkers::
colormatched bumperettes::Top Speed Pro-1 exhaust::
my cardomain/pictures page
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10-19-2007, 09:16 AM
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#4
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Registered User
Join Date: Jul 2007
Location: Arcadia CA
Posts: 91
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Quote:
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Originally Posted by djomlas
yeah, i take it easy.
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LOL... nice
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10-19-2007, 09:25 AM
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#5
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Registered User
Join Date: Jul 2006
Location: Virginia
Posts: 916
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"yeah, i take it easy."
10.8 mpg, wow, I'm impressed, is that for a whole tank, or just a bout of spirited driving, and have you done any intake/engine/exhaust mods?
Ed
__________________
My Car Webpage
2000 2.7L Boxster 102K; TTP intake, headers, high-flow cats; Dansk high-flow muffler; Autothority ECU chip; TechnoTorque 2; Bilstein coilovers; Racing Dynamics strut brace; stress-bar suspension kit; Aasco lightweight flywheel, B&M short shiftkit; 18" wheels; spare tire delete; OEM GT3 seats; JL audio speakers and subwoofer; Alpine PDX-5/PDX-2 amps; Kenwood DNX8120 CD/DVD/Nav; litronics, deambered
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10-19-2007, 09:38 AM
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#6
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There Is No Substitute.
Join Date: May 2007
Location: West Coast
Posts: 3,253
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My best milage was on a road trip at about 28-31MPG
I average about 22-24MPG (mostly city) maybe even up to 26 when it is a lot of highway.
The worst I have ever goten was about 15-16MPG, that was becauce I ran the engine with the AC on while I was working my stereo.
That's on a 2.5L
__________________
1999 Ocean Blue Metallic Boxster - blueboxster.com
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10-19-2007, 09:10 AM
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#7
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Registered User
Join Date: Jul 2007
Location: Arcadia CA
Posts: 91
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21 MPH 90% highway. sucks
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10-19-2007, 10:47 AM
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#8
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Registered User
Join Date: Jul 2006
Location: San Jose California
Posts: 220
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when i used to do all city driving I would get 10-14mpg. averaging 195-215 miles in range for one tank.
now that I do a combination of city and hwy I get 18-20mpg.
best range I have gotten with mostly hwy has been 296miles for one tank. pushing the needle deep in the red.
__________________
2001 Boxster S
Gemballa front bumper/Aerokit I Sideskirts/H&R suspension/997 short shift/Schnell front&rear strut brace/Aluminum pedals and floor board//Traffic pro/Console Delete//LED exterior lighting//Exclusive Options Full Leather/19inch Ruf Wheels/European rear bumper with 550 mesh/Zientec spoiler/IPD Plenum//Cold Air Intake/Hardtop/Speedster Humps
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10-19-2007, 06:07 PM
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#9
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Registered User
Join Date: May 2007
Location: Suwanee GA
Posts: 87
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My average mileage with the S is 23. With my 2000 Boxster it was 26. However, unless you have an accurate easy to measure your mileage, such as with a GPS, your mileage records might not be accurate. I have known that my speedometer was high, thus my odometer was reading high. With the help of the local PD I took readings on my speedometer today. At an indicated 50 my actual speed was 46. This is a huge error, in my opinion. roughly 8% at that speed.
Are there speedometer gears available for the Boxster S that I can use to adjust the indicated speed?
Tom
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10-19-2007, 06:15 PM
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#10
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Registered User
Join Date: Jul 2004
Location: Houston, Texas
Posts: 7,243
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Best 28, going downhill all the way on the freeway with cruise control from Albuquerque to Dallas. Sizable drop in elevation.
Worst? 12 mpg on the tail of the dragon. Worth every penny for overpriced $3.50 per gallon premium!
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10-19-2007, 07:20 PM
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#11
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There Is No Substitute.
Join Date: May 2007
Location: West Coast
Posts: 3,253
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During a road trip my OBC read 511 miles until empty for about 15 minutes after I filled up, then I actually started driving and it decreased to about 320. But my average mileage on a tank is about 280, which seems normal, and much better than some other sports cars.
__________________
1999 Ocean Blue Metallic Boxster - blueboxster.com
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10-19-2007, 09:15 PM
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#12
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Registered User
Join Date: Sep 2006
Location: Los Angeles
Posts: 373
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15 mpg here. My commute is 2 miles every day, and the fact my engine never warms up shows 
Also think bad O2 sensors are not helping, I'm wondering how much it'll help when I replace them.
-David
__________________
1995 Silverado V8 - Green/ Tan (FOR SALE)
2000 Boxster S - Ocean Blue/ Graphite Grey
2002 GSXR750 - Blue/White
http://www.darkoven.com/sig.jpg
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10-19-2007, 10:33 PM
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#13
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Registered User
Join Date: May 2006
Location: North West,UK
Posts: 123
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Mine are Imperial Gallons not US, but they are close.
Best 31.5 on a 400 mile trip
Worst 9.1 on a track event
$3.50 a gallon, I wish. Its 1.05 GBP for a litre of Shell Vmax (99 RON), 4.54 L to a UK Gallon equals 4.55 GBP per gallon which at exchange rate of 2.05 is 9.77US per gallon. The kicker is that most of this is tax.
I am going to do a Thelma and Louise now
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10-20-2007, 02:53 AM
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#14
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Guest
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Quote:
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Originally Posted by David N.
15 mpg here. My commute is 2 miles every day, and the fact my engine never warms up shows-David
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David, this has got to be a major killer for a car...especially our Boxsters. You need to find a longer way to work! 
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10-20-2007, 02:51 AM
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#15
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Guest
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Quote:
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Originally Posted by RandallNeighbour
Worst? 12 mpg on the tail of the dragon. Worth every penny for overpriced $3.50 per gallon premium!
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+1
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10-20-2007, 05:29 AM
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#16
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Registered User
Join Date: Aug 2007
Location: Aberdeen, Scotland
Posts: 137
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Quote:
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Originally Posted by RandallNeighbour
Worst? 12 mpg on the tail of the dragon. Worth every penny for overpriced $3.50 per gallon premium!
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you lucky buggers we pay about £5.00 a gallon for premium, work it out $9.50
dont you ever complain, EVER. lol
J
__________________
Had:
95 Vauxhall Tigra
99 DC2 Honda Integra type R
00 Audi TT 180 coupe
02 DC5 Honda Integra type R
01 Alfa Romeo spider 3.0 V6
01 Honda s2000
03 Audi TT Roadster 225
02 Porsche Boxster S silver/red Rolling on 19's
No w:
http://img.photobucket.com/albums/v4.../mycayman1.jpg
07 Cayman Guards Red/black on 19's
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10-20-2007, 08:56 AM
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#17
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Registered User
Join Date: Sep 2006
Location: chicago
Posts: 3,510
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Quote:
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Originally Posted by Bambino Don
you lucky buggers we pay about £5.00 a gallon for premium, work it out $9.50
dont you ever complain, EVER. lol
J
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now that SUX.
but if i had to pay that much for gas, i wouldn't drive anything else but a box
__________________
http://i34.tinypic.com/157yslk.jpg
"I couldn't find the sports car of my dreams, so I built it myself." ~F. Porsche
Gemballa springs::litronics::Eurotech 18s(275/225)::B&M::MOMO wheel::
exhaust cutouts::EVOcoldair intake::OEM smoked tails & sidemarkers::
colormatched bumperettes::Top Speed Pro-1 exhaust::
my cardomain/pictures page
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10-22-2007, 01:42 AM
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#18
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Registered User
Join Date: May 2002
Location: San Jose
Posts: 1,889
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99.9......
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