From a fuel economy perspective, is it worth buying the 335d or X5 Diesel?

Car Tips | September 26th, 2008 by 11

This is a question that I am sure most of you thought about it or even attempted to do the math on it. It is …

thumb bmw diesel 1 2

This is a question that I am sure most of you thought about it or even attempted to do the math on it. It is widely known that the diesel gallon price in the U.S is higher than the petrol, a complete different situation can be found in Europe, where the diesel prices tend to be lower. So, will it make sense from a fuel savings perspective to buy the 335d, or the X5d instead of the petrol versions?

Well, here are some stats and an analysis made by one of our dear readers(Thank you again):

BMW 335d
0-60 mph in 6.0 sec
MPG: 23 city/33 hwy

BMW X5 xDrive35d
0-60 mph in 7.0 sec
MPG: 19 city/26 hwy

Using average mpg figures, an average petrol price of $4.52/gallon and an average diesel price of $4.81/gallon, it only takes an extra $6.38 to fill your diesel X5, yet that fuel will yield 99 more miles per tank!!!

You spend an extra 6.4% per fuel fill-up, yet you benefit 25% better fuel economy.

Is this something you would be interested in?

11 responses to “From a fuel economy perspective, is it worth buying the 335d or X5 Diesel?”

  1. bmw4life says:

    I would be interested in getting a diesel if the diesel car costs where similar to a petrol ones… on average diesel costs 5-7K more. So it will take a few years before you can actually start enjoying your savings. Is it good for the environment – absolutely, your wallet – don’t think so

  2. Gragop says:

    Yeah – I’m really interested to see how these new diesels perform. Around 2003~2006, I saw a few diesel Mercs here and there but I think there’s still a stigma of dirty, cheapness to diesels in the U.S. While it’s not the case now, I’m still interested to see how these cars are received by this market. I’m sure they’ll be very popular among enthusiasts.

  3. BMW sales says:


    From the sales side, I have a list of people who want to be notified when we receive the diesels. They are very interested in the torque curve. I think you are correct, it will be interesting to see how the market actually accepts the diesels. From my own standpoint, people are more concerned with the performance, not actual to-the-penny savings.

  4. danny says:

    i’ve been a long time bmw fan, and when i started working full time in 2005 i was extremely close to buying a 325i at the time. but i had to change my mind as i drive 160km/day (to and back from work), and it was stupid to not go with a diesel.

    been driving a vw tdi for 3 years, averaging 4.8L/100km (about 50mpg) over 3 years highway/city combined. i know its a 100hp/180lb-ft motor, and not this beauty bmw has made though..

    i spend about 180-200/month on diesel where it would have been around 400/month for petrol, so it was an easy choice. i’ve always wished bmw would bring a diesel to north america, but was hoping for something more like a 320d… 335d sounds incredible, but a bit overkill, especially at 10/7.2L/100km (city/highway)

  5. azp says:

    For me biggest advantage of diesel is its fuel economy when you drive it hard. I own chippied 330cd with ~ 260PS, i’am driving it like i stole it all the time, and my average MPG is 19MPG city and highway/normal roads. In petrol engine with similar power i’d be getting 11-13 mpg.
    If you drive like a normal person petrol engine is better, does not have the torque bit it sounds great, gives you 50% more fun. Diesel is more boring to drive, ane has very short 2nd and 3rd gear, but when you floor it, it just goes and goes and costs you half less then petrol.

  6. Gragop says:

    @BMW sales:

    That’s a good point. BMW’s in the US aren’t at price points where $.50 to $1.00 swings in fuel costs will seriously affect a buyer’s decision. On forums the big thing about diesels I keep hearing is the torque, like you said.

    However, as BMW moves to widen it’s appeal to new customers, perhaps more environmentally-focused clients, I think we’ll see their US engine range expand, hence BMW considering diesels and 4 cyclinders for the US market. Honestly, I know it’s slow but a high-revving, hand-built 4 cyclinder E90 320Si would sell me in a heart beat – especially if it’s mid-engined.

  7. vtsung says:

    If the X5 with 535xd weighs around 4500 lb in curb weight (by not getting the roof rack, the running board, the tow-hatch and low deferential gear.) I may get one. I do miss the V10tdi in 6 tons over weight Touareg. Then, again, the coming u p inline 6 tt which is under the hood of 09 740i gives the driver 332 ft with 326 hp on his/her tap, the decision would be hard for Bimmer fans to choose the diesel engine over this petrol one that might trickle down to 5er, 3er or even 1er.

  8. Horatiu B. says:

    @azp: I think it comes down to what a bimmer fan values most, a faster bimmer or a decent MPG with still some power behind it. I’m really looking forward to the 335d test drive, then I can compare it to my car, which is a 335i and see the differences. I for one, don’t drive too much, thanks to great Chicago transit system, so I would probably keep the petrol one, but ….you’ll never know in the end if I fall for the diesel.

  9. Lance says:

    The problem with diesel engines is that they do not last as long as the petrol ones. If you are someone who drives hard, expect the engine to give problems, expect to have turbo problems. That is the only bad point about Diesel engines. The turbo on BMW diesels last about 110000km.

  10. RawAutos says:

    To me it’s worth it. Let’s be real, BMW’s EPA numbers have always been lower on the addendum sticker than they are in real life… Where the 335d says 33mpg on the highway, it’s probably more like 37-40mpg, depending on the driver, of course.

  11. okeribok says:

    @Lance: No, diesels last longer, have less moving parts and have larger service intervals. Yes the turbo (also petrol turbos) wears out, but how fast depends on how you treat it; you need to have your engine cool off a little when you have been driving hard, before turning it off.

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