mine is very similar to SleepRM3... rarely do I see a tank where its 20+mpg, mainly b/c I rarely do a whole tank on the highway...

 

Good to know. I thought there was something wrong with my car--like the ECU was tuned too rich, or something

 

I rarely do a highway only tank too and usually get around 16 mpg in Los Angeles in light/medium traffic with spirited driving. Highest I ever saw was 19 mpg but that was half highway and half in town.

 

On a recent trip to AR for the Palooza in Nov. my early 95 car got 25.73 mpg on fairly flat hwy miles using 93 octane. During verrrry spirited drives with a heavy foot on huge twisties in Eureka Springs I averaged 17.89 on 93 octane. No complaints!

 

Ninemeister have recently been investigating some interesting technology. If we apply the tech to a fully optimised aircooled engine, we think we could significantly improve fuel economy (+10% or more?) whist also making the engine faster. Without going into more details, the question is: would 993 owners (you guys!) want to have your cake and eat it?

 

I got in the mid 20's driving my car home from LA with my speed averaging about 80mph. I would guess I average around 17-18mpg since I got her home.

 

I made the mistake once of having the OBC set to "mpg" while at an early track day in the UK. Approximately 9 mpg was the number I remember. Never did that again.

 

Absolutely. Bigger issue is what you call fully optimized (US spelling!). Let's take, for example, my stock '97 4S. At 10K mi/yr. and US pricing, the difference in not buying 50-60-70 gal/yr. is at most $300. If we're doing anything else more than programming changing, start calculating the payback timeframe.

Which is even lower with many of the cars only getting driven 2-3 K mi/yr.

I'm purposely fully disregarding performance gains, as you can rationalize that on a completely different level.

 

When I bought my first 993 ('97 C2 Coupe) I was surprised at how efficiently it ran on the highway - MPG usually in the mid to high 20's and up to 30+ MPG with careful driving and use of cruise control. I recently bought a '97 C2S with factory aerokit and my first long highway trip only yielded 21-22 MPG. I'm wondering if the aerokit creates more drag which might be hurting mileage, or if it's some other factor. Around town, with relatively spirited driving, both cars get in the 17-18 MPG range. Why the big difference on the highway?

 

Yeah, can you believe these guys complaining about double digit MPGs?

 

So what you are saying is that in general most US Porsche owners will not make an emotional connection between improvements in fuel consumption and a reduction in emissions, whereas they will all connect and respond favourably to a significant performance increase? Interesting.

 

Reduction in emissions? That's a good laugh to keep the day rolling on a lighthearted note. Most of us here probably have dreams of piping emissions unrestricted exhaust into our various local, state, and federal legislative buildings............

I do know people irrationally spend money up front for long, long, long promises of savings on the back end. Was just pointing out that given the average mileage these cars are now driven there probably isn't much demand when you figure the fuel savings are under $100/yr.

As far as performance, you know and I know it takes a pretty significant bump in power output to actually make a measurable difference in the driving experience. But that hasn't stopped the K&Ns of the world, now has it?

 

I think gas mileage and emissions reductions might be looked at as added benefits to a performance enhancement. But agreed that we would likely not implement it for the green reason alone. Most of us drive our cars very little, so fuel cost is not a big deal.

 

Mine's a daily driver. It's a Porsche, and it snows and rains in Germany While 93-Octane Shell V-Power ranges between $3.62 and $4.05/gallon--I was just wondering if my mpg was par for the 993 course.

 

I have the luxury of the nearest traffic light is 190km away. So open road driving = 9.8 to 10.5 L / 100 depending on my foot.