Avensis fuel consumption increased

[Liopik]

Hi folks, 

Recently I noticed that my Avensis T3X 2006, 1.8 petrol is doing about 90 miles less per tank. It used to be 470-500 miles per tank, and now only 400. Is it because of winter? I checked the oil level and is ok. The only thing I noticed that when I press gas all the way down to get speed on motorways then after few minutes I can feel some burn smell inside car. It's not tyre definitely (with 130bhp It's impossible to burn the tyres on 5th gear:) ). Don't know to worry or not yet. 

[+robster+]

Clutch slipping?

[Liopik]

4 hours ago, +robster+ said:

Clutch slipping?

No. Clutch seems ok. 

[m456an]

I get 390 miles, no motorway driving. Though when I changed spark plugs to cheaper Iridium twin tip denso mpg decreased from 39 to 35? Maybe you need new spark plugs?

[Hilltopcruiser]

Would have said its likely due to winter, my MPG always drops this time of year. 

[Willss]

My mpg on my 1.8 has dropped from 40mpg to 36mpg in the past 8 weeks.  Wet roads (seem to make a noticeable difference) and colder temps (likewise) account for this in my opinion.  All rural road driving (3-15 mile journeys) no dual carriageway. Says 460ish on range when filled up (but still 100 miles left in tank when I reach 0 on range). 

Had burning smell when got a stone trapped behind brake pad, apparently prone to this according to garage. Unlikely to be your issue but you never know!

[Liopik]

With new full tank I drove much more careful, with no harsh acceleration or breaking, no overtaking on 5th gear. And, as a result, I made 485 miles from full tank with 7 litres still in the tank when I filled up after. That's 50/50 town/motorway. And no burning smell any more. So, I have no idea what it was. 

[JohnP1961]

I've just done about 520m on a full tank, (1.8 7A-FE 2000yr) with about 450 of that all motorway, trying to stay around 70-80mph, with lots of heavy rain, newly inflated tyres (32psi) and to be honest, was a little disappointed, although I'm well overdue for a plugs change