1985 Porsche 911 Long-Term Road Test - MPG
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1985 Porsche 911 Long-Term Road Test - MPG


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1985 Porsche 911: Langstrecken

October 19, 2011

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I'm going to start out my 911 Rennsport road trip chronicle backwards, with my fuel economy. Porsche pegs the capacity of the fuel tank at 22.4 gallons. Even with the dent in our tank, which might knock that number down by .2 gallons, that's bound to give our Porsche a mighty cruising range. Just how mighty I found out on my return trip Sunday night.

501.7 miles.

I did that on 21.637 gallons which gives puts my fuel economy just above 23 miles to the gallon. That's not bad when you consider the first 80 of those miles were done in the city and the rest were at Autobahn-esque cruising speeds. To the list of fluids used, add two quarts of oil, which I added at a 76 station on Friday night.

On a related note, filing up a car as small as our 911 with over 21 gallons of gasoline made me start to wonder if it was just pouring out of a hole on the tank as quickly as I could pump more in.


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Kurt Niebuhr, Photo Editor @ 121,832 miles


1985 Porsche 911 Carrera: Milestone

September 21, 2011

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The odometer rolled over 120,000 miles on Interstate 5 up on top of the mountains near Pyramid Lake. We were coming back from Mazda Raceway Laguna Seca, the return leg of a 750-mile trip to see the Porsche 911 GT3 R Hybrid in action at the ALMS event.

That’s 5,351.4 miles since we got the odometer working, though as Scott Oldham observed at the 119,000-mile mark, we rolled up some good miles between then and the car’s purchase in April.

We still have to do a rough-and-ready calibration of the odometer, as the speedometer is more than 5 mph optimistic at 60 mph (more like 8 mph, actually), just like all the Porsche 911s of the 1980s were. But that said, we’ve recorded an average of 20.6 mpg since June, with a best of 27.6 mpg and a worst of 14.1 mpg. Our farthest observed cruising range has been 385.6 miles. Once we get our observed odo calibration, we’ll go back and correct these numbers.

At our last accounting, we totaled up the money we’ve spent on maintenance and repairs. The mileage exceeds the dollar amount, which is always a good sign.

We have some more distance trips planned for this car, notably Mazda Raceway Laguna Seca October 14-16.

Michael Jordan, Executive Editor, Edmunds.com @ 120,085 miles

See full article and comment.


1985 Porsche 911: To Pebble Beach and Back Part 5

August 27, 2011

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When you return from a long road trip there are still a few things to tend to. First you wash the car. Then you hit the gas station and calculate your mileage.

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I ran three tanks through the Porsche on this trip. And I've already calculated for the car's optimistic speedometer and odometer, which adds about 10% (80 mph is really 72 mph).

The first tank was all highway. We traveled 194.9 miles on 8.125 gallons for 24.0 mpg. The next tank has some city and nearly 200 miles of twisty Rt. 1 action. We traveled 221.3 miles on 10.636 gallons for 20.8 mpg. The then the final tank was mostly highway again, but we hit some bad traffic in Santa Barbara for more than an hour. That tank worked out to 223.4 miles on 10.131 gallons for 21.0 mpg.

If you ask me, that's impressive.

Scott Oldham, Editor in Chief.

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