You just don't need to twist it that high. The MCS makes good torque and can lug below 2000 rpms, you just aren't going to accelerate as fast. I use 5th gear at 45-60 mph and 6th above that. Let the engine torque its way around, you won't hurt it.

By the way I knock down about 24-25 on short trip (4 miles) medium speed two lane roads. On the freeway I'm getting 28-29 but I cruise at 79 mph almost always with occasional blasts up to who knows what (110 mph)....I just can't keep my foot out of this thing. Drive it conservative on the freeway (do the speed limit in 6th gear) and I have no doubt it would get well over 30.

Cheers! Happy weekend!

 

2005 MCS. 205-45-17 Pirelli Euforia runflats, 38psi front 35psi rear. 15% reduction supercharger pulley, VGS, balance mechanically stock. Southern California climate. Daily solo commute 20mi each way, ~2/3 surface street, 1/3 freeway. Occasional longer freeway trips. Note discrepancy between OBC avg MPG and MPG computed from odometer and gas pump readings. Also not relationship of MPG to avg speed.

 

Why do you run your tire pressures so high? Mine are set at 30 front and rear.

 

I run mine 37 front and rear cold. Higher pressures yield quicker steering transisions and lower rolling resistance for better fuel economy. At a drag strip, you want to lower your pressure for off-the-line grab.

 

Sorry to be excavating the dead, but I thought I would pop in here with a question. I have an 03 MCS, 42k miles, still driving on runflats. My commute is 160 miles/day. Of the 80 miles each way, 76 of those miles are freeway, with little traffic. I generally cruise at 3500 to 3750 RPM on the freeway. The best mileage I have seen yet (calculated, the OBC lies) is 26. Average is about 24. Since the weather turned really cold last week(low-mid 20's for the AM leg) my MPG has gone way downhill. Used 1/2 tank on the 80 mile AM leg yesterday!
What's up?!!! Why would cold ambient temp have any effect on MPG, after the engine has warmed up?
I always use tier 1 gas, but the best we get here is 91 octane.
I'm stumped. Anyone got any ideas?

 

3500 to 3750 rpm? Is this an Auto? I cruise closer to 3000-3200 RPM which puts me around 70-75.

I've noticed that cold weather always reduced my gas mileage, but only by 10-15%

 

No, not auto. The speed limit here is higher and I tend to push that a bit.

 

wow, i get between 28 and 30 with 66.66% highway. i'd better start thrashing this thing .

 

I have niticed tha resetting the ECU in the winter & summer eases the fuel economy problem a little.

 

I commute 100 (90% Highway) miles a day and average about 28 - 32 mpg on my 2002 MCS. The only mods I have is the Alta CAI.

 

1. For your driving the 91 octane should be good.
2. are you running up the revs in each gear? It is fun - but eats gas.
3. What tire pressures? Cold weather has an effect on the airpressure in the tires. For best gas milage use the fully loaded pressure on the door (I think it is 36 psi, but I am away from my car).

 

I generally shift at around 4k. There are times when i do play with it, but not too often. I've been trying to keep the pressures at around 35, but with the cold weather, they may be going below that in the early AM.

 

When gas was expensive I was shifting to 2 at 1500, and the other gears between 2k and 2500. Makes for slow going but with amazing resluts for MPG, even in town.

Most of the time I shift at (or near) 3k unless I'm trying to skoot.

 

Seems like a good time to revive a dead thread - I took delivery of my 05 MCS with 8k miles on it 7 days ago - I've been getting 20mpg 100% city driving with two big hills a day.

 

I drive like an old man, and I get 17.8 mpg....please tell me what I'm doing wrong.

I drive 60mph on the highway, little stop and go. Coast when I can, not alot of braking, a few hills. Shifts below 3000k .

02 MCS Just bought it second-hand.

 

Maybe it's time for a new 2007.

 

Just doesn't add up. You might do a little better shifting just over 3K, and maybe doing 65 on the highway. In 6th gear of course.

Is this car stock? How many miles? Do you know what maintenance was done? Maybe time for new plugs & wires, a clean air filter, a can of Techron injector cleaner in the tank. Using the correct oil? Tire pressure?

You should be getting at least 25mpg, closer to 30.

 

Far as I know it has a BMP Racing Intake, and Borla Exhaust. I know nothing else.

The car as 73000km's. And like I said I just bought it. It is a 2002, I did buy a 48mth/80000km warranty from dealership I bought it from.

I'll take it back, tell them about the P/S Hiss I have, Clatter in the Engine, and Poor Mileage.