subter

I had mine done a week ago. Everything works on mine as stated in the bulletin. My driving is 65-70% city so my mileage was great before the update. I haven't noticed any change in mileage but I also drive 66 MPH on the highway too. I'm guessing as suggested elsewhere this update helps those that are driving more highway miles and faster highway speeds. It may boost mileage in colder months as well.

That's the one thing I do agree with you on. The highway figure is inflated. I'm beating the EPA figure but with a 65/35 city/highway split.

Because gas vehicles aren't the same technology as battery hybrids. You live in Arizona. Batteries don't perform well in extreme heat not to mention you'll be running AC most of the time. I'm in Michigan. Temps here are mild right now. I'm averaging 50MPG a tank. In the middle of January here I don't expect to do so well. Your expectations have to match the technology.

First, if you want people to take your comments and opinion seriously, you should just make a point to hone your spelling skills. It's suit, not suite. Second, it's your opinion that the lawsuit was justified and the court's opinion that it had merit. That doesn't mean it's morally correct or that most people agree. It's a poster child example of the problems with tort law. Third, you mention you drove a vehicle that got high twenties which was within a couple MPG of EPA estimate. People don't understand that with a vehicle rated so high if you get 10% less than the 47 rating, that's 42.3. With a vehicle rated at 20 MPG, if you get 18, it's the same 10% but doesn't seem as drastic. If you buy this car and drive it like most people drive on the roads today (accelerate as fast as possible, brake as late as possible, 75-80mph on the highway) you're not going to get anywhere near 47 MPG. I'm driving the car conservatively based on all the tips on this forum and I can get low 50's in perfect conditions. People have to understand that speed, acceleration, braking, outside temps, elevation, HVAC and other factors contribute to gas mileage. I get 54 MPG in perfect conditions on my way to work (1,000 ft elevation to 600 ft over 27 miles) and 44 MPG on the way home because it's all uphill.

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Several insurers offer it now. I signed up with the Snapshot program with Progressive. I'm getting a 30% discount now that I'm driving like an old man in my CMax. This program measures the number of hard brakes, the time of day you drive and mileage.

Doesn't have to do with SE vs. SEL, it's the package level. Very base SE with no package level upgrades won't have it. SE with equipment group 201A will.

There are several other valid reasons for this to occur such as this: http://www.sciencedaily.com/releases/2005/10/051023120710.htm Also, ambient temperature as gas expands/contracts.

I'll have to wait until my mileage flattens out to try. I'm only on my third tank and mileage has been going up on each one with the weather. You'd really have to be consistant though. I'm going 2 plus weeks between fill-ups. With summer coming up, I could go two weeks with little or no air con. then two weeks of blazing hot with lots of air con.

The answer is long and complex depending on many factors. Gas differs from region to region and brand to brand. Ultimately good quality premium with quality additives and low ethanol can increase MPG small amounts. Most articles will just say it's a myth because the increases can be close to nothing. Most vehicles you won't notice a difference because it's a 5-10% increase in the best of scenarios. On a Cmax or a Volt, etc., it's more noticable. Problem is premium gas carries a 5-10% premium in price so you'd have to do the math on different brands and prices every fill up. Ultimately it probably wouldn't hurt because even if it's a wash financially, the gas may contain better additives so you'd realize the benefits from that. Also, seems like it would be almost impossible for the average driver to duplicate conditions over two tanks of gas. The odds you'd drive the exact same way, the exact same trips and have the exact same weather for two different 600 mile tanks would be mighty low in my opinion. Especially if you're talking 3-4 mpg average per tank.

I agree. After learning all the driving tips, the biggest impacts I've witnessed are outside air temps 1st, then running the air conditioning second.

Are you using air conditioning?

It's been said many times but there are so many factors involved in fuel economy, some obvious, others not. Elevation has lot to do with it also. You don't need huge mountainous roads to negatively affect mileage for example. I'm in Michigan. There isn't drastic hills here but there are lots of little ups and down in places. My drive into work is overall a slow decline so mileage on the way home is negatively affected but you wouldn't really notice it unless you track the eleveation on a GPS. I'm at almost 43 MPG lifetime (with no reset-27MPG avg. at 95 miles when I took delivery), 1,700 miles. Bought in March. 514, 541, 570 on first three tanks and on track for over 600 on current (46.8 MPG avg on this tank). Temperature has been a huge impact for me. I was getting low 40'sMPG at 30 degrees, this morning I got 53 MPG at 63 degrees.

OK, how about the 1,000 mpg challenge. I'm almost there.

I was just busting chops. It's definitely a crapshoot though. I just talked to a guy at work last week that it happened to. Wasn't in a Cmax but Ford wouldn't warranty the pump.