Gransport MPG - Owners experience.

Ebenezer

Member
Messages
4,445
I think the 6th gear is taller, certainly in the ZF to the Duoselect QP, and maybe the Duoselect has taller gearing than the GS/4200
Eb
 

hunta

Member
Messages
405
A more useful guide might be range on a full tank. The GS has an 88 litre tank. It gives it a range of 300 miles with reserve warning light coming on at 280 miles or so. The Porsche Turbo also has a 300 - 320 mile range. But it has a 65 litre tank and comfortably does 24-28 mpg and long journey cruising steady on motorways returns 31/33 mpg and it runs 450bhp versus the GS 400 bhp.
"...although it is a Porsche, and not a Maserati."

Just felt your otherwise excellent balance of arguments was missing that vital piece.

:)
 
Messages
1,117
I am fortunate in that I have both cars as stablemates so comparisons are going to creep in.

The GS is a great car. So is the Turbo. Both are quick. But the Turbo Is ballistic quick and the all-time 4WD lays down the torque and power beautifully and returns very good mpg. Both are occasional 'summer cars' so fuel economy is not a serious consideration. Both do around 300 miles on a full tank, but the GS has a much bigger tank at 88 litres.
 
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mjheathcote

Centenary Club
Messages
9,033
Don’t know how you’re getting those figures Richard! Drive it like a nun I couldn’t get them in mine

I can't either!
Best I've seen is 22/23 on cruise on the Motorway at 70/80 ish.
Quickly drops below 20 doing anything else!
 

philgarner

Member
Messages
226
Best I've done was 24mpg on a 70 mph long run to Heathrow with cruise on. Obviously any fun times and its more like 15.
 
Messages
1,117
I don't have cruise. Best is 21/22 ONCE. More about 12-16 mpg on mixed driving. Had seen occasionally 8-10mpg on country lane driving with a lot of 3rd gear and 4th gear and not seeing 5th or 6th.
 

gillis

Junior Member
Messages
77
I have driven about 40k miles in a 4200 in about 1.5 years. it's my daily driver.
the avg mpg after a week of commuting is 17.7 mpg or 6.3kpl. this is 80% highway.
the best I can get is cruising at 50mph. I get 26mpg. there is absolutely no way to get that higher.
 

jayblue

Member
Messages
452
Just over 20mpg on the motorway in my GS.

The rest of the time I don't think about it as its pretty woeful on fuel economy.

Luckily it also pretty brilliant at making me smile so the two even each other out!
 

JSP214

Member
Messages
131
I have driven about 40k miles in a 4200 in about 1.5 years. it's my daily driver.
the avg mpg after a week of commuting is 17.7 mpg or 6.3kpl. this is 80% highway.
the best I can get is cruising at 50mph. I get 26mpg. there is absolutely no way to get that higher.
Thanks, my circumstances are similar to this and I’d be fine with 17 mpg.
 

Corranga

Member
Messages
1,219
Manual 4200 here, so very similar car. 18 to 21mpg here, I’ve seen as low as 15 with town driving, but that’s to be expected
 

Delmonte

Member
Messages
878
Did some research for you this week. I'll mention it as these better than I was expecting...
Drove to the coast and back, total 160 miles. Outward was about 70% dual carriageway, 30% a and b roads, slow through villages but very little actual stop-start.
Return was a roads, no dual carriageway, some twisty stuff, varying mostly 30 to 80 mph, again little stop - start. No redlining or 'enthususstic' driving (was with wife....)
Average after all that was 17.7 mpg, flickering occasionally to 16.4 mpg....(nb they do this.... But it was mostly on 17.7)

As I get 12-13 urban commuting I considered this better than expected and I suppose the key is, don't stop and start much...
 

JSP214

Member
Messages
131
Did some research for you this week. I'll mention it as these better than I was expecting...
Drove to the coast and back, total 160 miles. Outward was about 70% dual carriageway, 30% a and b roads, slow through villages but very little actual stop-start.
Return was a roads, no dual carriageway, some twisty stuff, varying mostly 30 to 80 mph, again little stop - start. No redlining or 'enthususstic' driving (was with wife....)
Average after all that was 17.7 mpg, flickering occasionally to 16.4 mpg....(nb they do this.... But it was mostly on 17.7)

As I get 12-13 urban commuting I considered this better than expected and I suppose the key is, don't stop and start much...
Thank you, that's incredibly helpful and very closely mirrors my commute, (apart from the distance). I drive between 30-80mph on dual carriageways / A roads and in the worst case scenario have 9 stop/starts. I'm fine with about 17mpg so your findings are very encouraging and in line with what I was hoping.
 

Zep

Moderator
Messages
9,110
Did some research for you this week. I'll mention it as these better than I was expecting...
Drove to the coast and back, total 160 miles. Outward was about 70% dual carriageway, 30% a and b roads, slow through villages but very little actual stop-start.
Return was a roads, no dual carriageway, some twisty stuff, varying mostly 30 to 80 mph, again little stop - start. No redlining or 'enthususstic' driving (was with wife....)
Average after all that was 17.7 mpg, flickering occasionally to 16.4 mpg....(nb they do this.... But it was mostly on 17.7)

As I get 12-13 urban commuting I considered this better than expected and I suppose the key is, don't stop and start much...

Am I right in thinking that the 4200 mpg displayed is US gallons?
 

Delmonte

Member
Messages
878
Am I right in thinking that the 4200 mpg displayed is US gallons?

Wow, I have no idea! In fact, I kind of, sort of, didn’t know the yanks had a different gallon......
Sorry if that makes my contribution completely redundant...
 

Zep

Moderator
Messages
9,110
Wow, I have no idea! In fact, I kind of, sort of, didn’t know the yanks had a different gallon......
Sorry if that makes my contribution completely redundant...

Not at all, nothing is wasted. I think the link I posted shows you how to check which one your car is measuring.

They even have different weight measures. The short ton (US) Long Ton (british imperial) and a metric tonne. All of which are different from a metric **** tonne.