Janspeed manifolds - Worth the money?

[MG ZS STE]

The only time I've seen mileage that low was when I've had a faulty precat lambda.

[talkingcars]

Basically 10 miles each way, national speed limit virtually all the way, dual carriageway for 95% but broken up by 12 roundabouts and a set of lights - fun but no good for economy.

On the other hand I have achieved 400 miles on a tank so I know it is possible on a long run.

[Maxfly]

I'm get about the same as James, 12min drive to work so car barely gets warm and the majority of it is 30-50 zones so poor mpg to be expected....part of the reason I now bike to work and only take car if I have to plus it's only 3mins more cycling.

Although when it was a 70 mile round trip for work I would easy pass 300miles but that was the previous zs's so not a direct comparison I suppose..

[Fred68]

Originally Posted by talkingcars

I'm lucky to get 220 with my regular commute.

I get more than that out of my V6 Freelander!! And way more out of my 180. Do you have a heavy right foot?

[Deckz]

I worked out mine at 32mpgs

[easytime]

I live 1.8 miles from work, she is not even warm when I knock her off at work. Also there are only 2 motorways in N. Ireland! And none of them near me!

[talkingcars]

Originally Posted by Fred68

I get more than that out of my V6 Freelander!! And way more out of my 180. Do you have a heavy right foot?

As per post 62.

[dave23572]

I average 29.5 since I bought my ZS in 2006

[talkingcars]

vvvvv

[Fred68]

Originally Posted by talkingcars

As per post 62.

There are lots of reasons for low mpg.
Lots of roundabouts is obviously 1 of them.
My daily commute is a mix of winding B roads with a 2 mile blast of duel carriageway. My 180 averaged 28mpg on the commute.
My ZS replacement a V6 Freelander does bang on 20mpg on the same route. It uses considerably more fuel than the ZS even though it's powered by the same engine. The Freelander is coupled to an auto box and weighs some 400 Kg's more than my old ZS180. Thus affecting the fuel consumption some what.

As for the breathing mods affecting fuel efficiency. In theory anything that helps the engine breath, in and out will improve economy. Sadly the extra performance is used by the driver. This generally makes economy worse.