HR versus DE fuel consumption

[JetSet]

I guess this'll only apply to people who've owned both but here we go. Since I've owned my DE Zed the only time the computer has been reset is when I've changed the battery (twice now) and my MPG has changed very little, it's been a good mix of roads, only a dozen or so runs of 100 miles or more on Motorways but mostly round trips of around 7-10 miles. My average has been pretty rock solid at between 25.8 and 26.0. Now today, I've changed the battery on Caroline's HR ,which is the first time since we've had it that the computer has been reset. When we got the Zed back in 2010 with 7k on the clock the computer read 21.1 and 21k miles later it had only inched up to 21.3, a lot of those miles driven by me. So, I took the opportunity to take it for a fairly gentle run today. 40 miles in my normal "economy style", changed gear at 2.5 to 3.0k and no heavy traffic, result 22.3 MPG. Now I know that the facelift roadster is somewhat heavier than my old DE coupe(and I suspect 95 RON fuel has been added ) but I did a similar run when I last changed my battery and got 30.3 MPG. Anyone else noticed this?

 

Pete

Edited March 11, 2016 by JetSet

[FooFighter]

I had a DE and then got an HR a couple of years ago (both tin tops). I have found my HR a little more thirsty but not by much, get low teens in town and high 20's on an motorway run. This is using super unleaded.

[Zeezeebaba]

I average around 25 mpg in my DE since the Uprev map. Before it was done it was around 27 but it was running very lean. What were the official figures for both DE and HR engines at launch? I would happily trade off a few mpg for the newer HR engine with a higher rev limit to be fair.

[Superman001]

I have now done four 430 mile drives in the last 3 weeks in my 2006 DE and each time I've calculated the mpg at 29-31mpg.

[davey_83]

HR more air in, more fuel in also? Less low down lb-ft = tad less less mpg.

 

The fact that it's always HR Roadster will be the biggest reason behind the fuel difference.

[Pritchard]

i get 41mg in my DE on a 65mph motowy run. (cruise control). at 70-75 its an easy 33-35mpg.

around town, 25-26.

 

thats with a remap.

 

ive added pictures and a thread before. ive not made the numbers up.

[Floydbax]

I struggle to get 13mpg daily driving, DE 'vert, but am always amazed at the 'touring' mpg which more than doubles and sometimes even trebles, even when being thrashed

[kbad]

I have had both DE (3 weeks) and now an HR and in the DE I got around 24-26 mpg around Milton keynes with all the roundabouts but with the HR I get between 19 - 21 mpg .

[Rook]

I find this interesting, as the 370z I've driven *appeared* to be better on fuel, not worse, and has the same breathing upgrade AND a bigger block relative to my DE.

 

The reported figures seem to support that the 70's better too. Anybody know why that might be?

[Richf]

My 370z is really good on fuel dunno what you people are doing wrong

 

 

Firstly dont rely on the display, it lies and secondly , fuel consumption is extremely variably and fluctuates wildly , the only way to get an meaningful comparison is to measure mileage against fuel used ie Fill to Fill and over a considerable time, but who bought their zed to do that ?.

 

I wouldn't expect a considerable difference between the DE and HR , much more between the Roadster and Coupe and auto and manual transmissions

 

 

 

Dont leave filling up until the range goes blank and you have to slipstream an artic just to make it to the petrol station - it does do wonder for the economy though

 

[Rook]

On the 'who bought a zed to do that'... I didn't buy a zed to do that but can't run two cars, so in order to have my weekend blatter I also have to drive it 400 miles a week to and from work, and it's all motorways so not exactly a spirited drive.

 

So the more I can save fuel on an already boring weekly commute, the more I can spend driving like a twit at the weekend and spend on spacers, inefficient but cool sounding air filters and soon an exhaust hahahaha.

[JetSet]

 

I wouldn't expect a considerable difference between the DE and HR , much more between the Roadster and Coupe and auto and manual transmissions

 

 

Just looked up the weights, HR Roadster is 150-160kgs heavier than a DE coupe, I thought it was something like half of that so it will account for nearly all the difference in MPG.

 

Pete

[spunkehmunkey]

I average a strong 23.1mpg. Mostly on the work commute which is 50% 60mph roads (constant red lights along it though) and 50% town driving. I think that is pretty good considering I like to let the rpm sit higher to get a bit of the Ark True Dual glory. (Car is a DE)

[GrahameJ]

My JDM auto coupe DE is giving a measured 24.9mpg on all roads commute including motorway at speeds to make progress and not save fuel. Measured in that I don't rely on the car computer, but fill up each time at the pump and note down the mileage and the fuel used.

 

Just fitted flyboy's airbox conversion (intake trumpet off HR) and I'll be looking to see if that makes a difference.

Edited March 14, 2016 by GrahameJ

[mattross1313]

My 370z is really good on fuel dunno what you people are doing wrong

 

 

Firstly dont rely on the display, it lies

 

Hah that's a good figure on yours

 

I use an mpg app (just a habit from my previous car as it didn't have a computer). The mpg display on my '70 is very accurate against the app - biggest gap was 0.2mpg but I put that down to rounding as the car goes up in 0.3's.

 

I am a little surprised by mine on a run compared to my old DE. With cruise control set to 71 i struggle to get over 30mpg, where as the DE would regularly return 34-36.

Edited March 15, 2016 by mattross1313