Drove 2000 RPMs on the highway for 1 hour - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Perfectlap · 06-02-2008, 02:20 PM

I saw a piece on a guy who drove from Chicago to NYC on one Toyota Prius gas tank. He basically stayed in the right lane stuck to the speed limit and coasted whenever he was heading down hill. He averaged 70 mpg! He pointed out how going slow on the highway really doesn't get you home that much later. "Maybe 5 mintues".

So yestereday I deployed this tactic on an hour long drive from the beach.
Lowered the top and stuck to the speed limit never going more than 5 miles over.
Sure enough EVERYONE was passing me, no doubt in a hurry to get home.
I kept the car in 6th and stayed constant on the throttle with the tach never going over 2100 RPMs. I got home about 15 minutes later than I usually would but the needle on the gas tank barely budged...hmmm.

Jeph · 06-02-2008, 03:07 PM

Quote:

Originally Posted by Perfectlap

I kept the car in 6th and stayed constant on the throttle with the tach never going over 2100 RPMs.

I'm gonna be sick. Get yourself a Prius already -you deserve it. (j/k)

Perfectlap · 06-02-2008, 03:13 PM

Prius?
Too expensive man...

I'll stick with my Porsche.

06-02-2008, 03:22 PM

Perfectlap, how fast were you going in 6th gear to only have 2100 RPM.

In 6th gear, at about 65-70 mph I am right at about 3,000 RPM.

pbanders · 06-02-2008, 03:30 PM

Why go slow!?! I drove up and back from Phoenix to our place in Flagstaff last week in my M3, windows up, A/C on. Door-to-door it's 175 miles, with only about 10 miles of the drive not on the freeway. You gain about 6,000 feet in elevation going to Flag, total climb with the ups and downs is probably around 8,000 feet.

I made one stop going up, my average speed overall was 67.1 mph, and I got 24.5 mpg. Coming back, I averaged 70.8 mph and got 29.7 mpg. I'll bet the Boxster with the roof up would have beaten these averages.

If I'd done as Perfectlap did, I probably would have gotten a few more MPG, but a much lower FPG

rick3000 · 06-02-2008, 04:06 PM

I do a lot of city driving (I hate it), but whenever I'm on the freeway in fifth at 2900-3200RPM my gauge never moves. Occasionally it will go up a few miles, because I'm getting better mileage.

I just don't think you'll see a huge difference cruising at 2100RPM, except maybe some premature engine wear from things building up in the engine. There was a thread a while back, that explained the going to 5000RPM is good for the car because it cleans the engine out.
Plus, going slow is just no fun!

Perfectlap · 06-03-2008, 06:51 AM

Quote:

Originally Posted by bmussatti

Perfectlap, how fast were you going in 6th gear to only have 2100 RPM.

In 6th gear, at about 65-70 mph I am right at about 3,000 RPM.

The speed limit on the Parkway here in NJ is 55. I pretty much stuck to it (saw two people get pulled over by the troopers). It really amazes me how fast people drive while they cry about high gas prices. The average speed was 20-25 miles over the limit and I'm sure the passing lane was well above that.
IMHO opinion the Roadster experience isn't that much different at 60 then at 80.
As a matter a fact at highway speeds I see no difference between any rate of speed until you go over 90+. I guess driving faster than you need to is like passing by a free buffet after you had dinner at home, 90% of Americans will eat a sandwich off the buffet even if they aren't hungry, simply because they can.

Most of my miles are done on the Parkway, I think I'm going to employ the "sticking with speed limit" tactic and see how much less I'm spending on gas over the next few months. If I want to stretch the BoxsterS' legs I go to the autocross 10 minutes away. It would be great if the Boxster had an electric back up for highway driving that you could remove and go fossil fuel during real hp driving. I'm way to frugal to blowing $60 on a tank of gas. This bs is getting crazy.
And that's coming from a guy that only drives weekends.

fatmike · 06-04-2008, 09:10 AM

If you've ever driven a Prius -- you wouldn't wish for a battery hybrid system in the Boxster. The Prius is, without a doubt, the worst handling car on the road. The batteries add mass and moment of inertia that is borderline unstable.

I would rather see Porsche focus their efforts going forward on building a lighter car. That will result in both better handling and fuel economy. A hypothetical Boxster that weighed 2000 lbs would have excellent performance from a 2.5 liter Direct Injected engine. It might also get 35 mpg+ on the highway. That would make the ideal daily driver for me...