wheel width went from 175 to 205 - fuel efficiency went down.

londonTiger

actually that's understated a bit. I was trying to even out the weather variation - the actual drop is lower - I jsut had the A/C on a lot because my windows would get fogged up and obvious the engine hard a harder time getting to optimal temps in the cold which reduced fuel efficiency. Embedded the actual stats below. it fluctuartes a lot - I put the alloys on mid Jan and the fuel consumption dropped like a pancake - but I did also use the stupid redex fuel system cleaner which messed up my fuel system I think.

Hintza

Hope you informed your insurer.

Dippypud

I don't suppose anyone has thought the temperature might have effected the calcs at all ...

or the gritting of the roads - weather in general as to style of driving ?

It could be a myriad of things altering the fuel returns ...

Chopper_Read

It's the revrsing back and forward in the box junction that's done it.

redux

There is slightly more rolling resistance, and also more aerodynamic drag. Special eco models usually have narrower tyres, for example 145 wide on the Audi A2 and VW Lupo 3L.

vikingaero

205 tyres are wider than 175's. Wider wheels generally = more rolling resistance = higher fuel consumption.

photome

vikingaero wrote: »

205 tyres are wider than 175's. Wider wheels generally = more rolling resistance = higher fuel consumption.

Simples

Did anyone study the graphs?

The Op starts off by saying

There's been a noticeable difference in mpg - dropped by 1 I think

As someone esle posted a bit of a non story

artbaron

londonTiger wrote: »

fuel consumption dropped like a pancake

Sorry, but I had to :rotfl:

StrongWork

londonTiger wrote: »

actually that's understated a bit. I was trying to even out the weather variation - the actual drop is lower - I jsut had the A/C on a lot because my windows would get fogged up and obvious the engine hard a harder time getting to optimal temps in the cold which reduced fuel efficiency. Embedded the actual stats below. it fluctuartes a lot - I put the alloys on mid Jan and the fuel consumption dropped like a pancake - but I did also use the stupid redex fuel system cleaner which messed up my fuel system I think.

Perhaps just accept that you and cars do not mix and get a bike instead?

It'll make the Motoring Section of the forum a quieter place

Norman_Castle

I jsut had the A/C on a lot because my windows would get fogged up and obvious the engine hard a harder time getting to optimal temps in the cold which reduced fuel efficiency. Embedded the actual stats below. it fluctuartes a lot - I put the alloys on mid Jan and the fuel consumption dropped like a pancake - but I did also use the stupid redex fuel system cleaner which messed up my fuel system I think.

Not the most accurate basis for a fuel comparison!.