Do you guys think the calculation is off? I was shocked when I saw the 38MPG when I stopped to fill up on fuel during my trip. As you can see, my average speed was 69mph at that point. For the vast majority of my trip, I was driving between 70 to 75mph. I never went above 75mph, so I did save some fuel by not going above the speed limit in AZ and NM. If that 38MPG is accurate, then that's extremely close to the real life highway numbers that the Lexus ES300h (hybrid) achieves.

 

i think it's possible. my last car got much better mileage when going about 70mph than the EPA estimated on the highway

 

Agreed. Used to have a 2011 glk350 w terrible mpg. Had to fill it up every 6-7 days. I was very surprised wen i got the new c class, i lasted 13 days before filling up again! This is only because i do most of my driving in eco mode, which saves alot of gas

 

Its good, stunning would be 50mpg Its a 4 pot remember, geared to economy. On a similar run to yours I get circa 42mpg (C200) same engine with lower power output.

 

but your gallon is larger than ours

 

I've taken that into account. Your reading is circa 45mpg in the UK so you're getting slightly better MPG than I am when the figures are adjusted. Either due to mileage, saloon vs estate/wagon dynamics, driving style or due to the extra power your engine delivers to shift a heavy car.

 

I am getting 45 mpg at best, even though I am trying to drive as efficiently as possible, I think that is really poor for a c300 hybrid! In a previous hire car- VW Jetta I was easily getting 60mpg and my previous bmw 320d efficiency dynamic would give 45-50 mpg even though I used to drive it like it was stolen all the time. Really disappointed at mercedes attempt at hybrids.

 

You really can't compare diesels against anything else, completely different power, torque, the works. A hybrid isn't just about good MPG, its also about less pollutants.

 

Normally, I would never use any car's computer for an accurate fuel mileage number. Most tend to be very optimistic, and often provide readings that can be as much as 10% high. Now having owned two different C300's, the interesting thing is that the numbers given by this car's computer are very accurate ... maybe even slightly conservative. When measured, my numbers are typically one or two tenths of a gallon better than what is shown on the computer.

Even the highways where I live ... in mountainous and hilly terrain ... are rarely level, so it's tough to get really great mileage numbers here. Still, on a recent run that was about 90% highway at 75 mph, I did see 35.1 mpg. For me, that was really exceptional. I think your numbers are probably quite accurate ... the turbo 4 is a very efficient motor.

 

I really wish MB would bring a Diesel engine (any Diesel option) to the C-Class in 2016. Around the world it is available, yet not in the US.

BMW has it.
Audi is bringing it for 2016
MB? Nope.

You'd see 50+ MPG on the highway, just like the rest of the world does.

 

Thanks for your input guys! I was just really surprised because I expected to get around the 34mpg that MB advertises. When I had my 2008 Infiniti G37 Coupe, that was expected to get around 24mpg, and when I did a couple road trips with that car, I did get right around 24 or 25mpg at the best. It was so odd that I'd get 4mpg better than stated numbers even though I was driving at high speeds.

 

My car, according to the MB website (UK gallons) was urban 36, combined 45, highway 54 I think, or thereabouts. I'm getting urban 30, combined 36, highway 42. ... and that's trying to drive conservatively. I've 2000 miles on the car, hopefully more miles might improve things. I've no idea how the hell they got 54 highway. Must be downhill with a tailwind.

 

I just completed 7500 miles of all highway driving, and I got 31-36 mpg. I noticed the biggest determinant of mileage was the wind direction. A big tailwind greatly improved my mpg.

 

Did you use the cruise control? I used it whenever possible, which was almost all the time. I think that definitely helped me since the car was closer to optimal than if I was controlling the speed.

 

I probably used it for half the time. It just wasn't always possible in heavy traffic.

 

The problem is BIO-diesel is taking over the US and BIO-diesel is bad for these engines. MB, BMW, VW/AUDI owners with diesel engines have all been experiencing problems. Their diesel engines weren't designed for BIO-diesel and Mercedes won't honor warranties if engine damage occurs because of BIO-diesel.

 

I disagree (do you mean USLS diesel issues?) and will add that it seems to be ok by MBUSA to have a diesel E-class, and occasionally Diesel S-class (up until 2014 at least), but its been forever absent in the C-class. MB doesnt want to bring the diesel over for other reasons, most likely Federal emissions regulations and testing.

And don't even get me started on what a great combo a Diesel-hybrid would be.

I want a small, luxurious, very fuel efficient car and MB cant help me unfortunately. Im not into plug-ins an the B class is totally electric.

 

No need to just wonder:
http://www.leftlanenews.com/quick-sp...id-review.html

 

At least my first 2 fill ups the on board computer has been generous vs what I calculated from the pump. 27mpg vs 26mpg calculated and 28mpg vs 26.7mpg calculated. I think Mercedes highway estimates are obtainable, but city estimate seems optimistic.

 

It's the U.S. C300, which is a petrol - so the observed MPG is good. The UK C300 is the diesel hybrid -(not available in the U.S.) which would expect 55MPG+. I will tell you when I get mine in a couple of week.

MB are tweeting the model number system, but still a bit confusing.

 

actually using cruise control can hinder mileage. coasting and tapping the throttle on the highway to maintain speed improves mileage (does for me) than leaving it in CC.

ive been getting 30mpg on back street commutes with tons of traffic lights. average speed is 33mph and in Eco mode. i think the c300 mpg estimates are underrated slightly, but it's likely that 'normal' people will drive it a lot less Eco friendly than i have been doing this first week

 

This is a Mercedes-Benz E250 Bluetec vs Prius mileage test. It is a good read.

http://www.roadandtrack.com/car-cult...-a-luxury-car/

Spoiler Alert: The Mecedes won!

 

The elevation above sea level helped your MPG on that leg of the trip. El Paso is at 3,800ft, Albuquerque is 4,900ft, and you descend down toward Phoenix at 1,100ft. Air density thins out enough a few thousand feet up to make a noticeable improvement in fuel economy. The car has less air to push through, so burns less fuel doing so.

 

...that is really good fuel efficiency, hombre (better than my best - 34.9 on a round trip to Monterrey last year).

 

As much as I hate the tractor sounds of the diesel at idle, the torque (500Nm) and fuel consumption on this car are incredible. Here's a pic from today... around 50MPG average.