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40.9 mpg is the best i could achieve

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Old Jun 13th, 2021, 21:06   #71
Christerart
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Excerpted from above: "...if you don't need a full tank because you're only doing local trips, you're carrying around all that extra weight of fuel which is less economical. "

True, but I like having a full tank so there's less air space for atmospheric moisture. The purge cycles of the EVAP system draw in air from the outside.

My long trips are less than 1/2 tank away. I let it go down during the outing but make sure it's full when I park it once home. This goes double when rain is predicted.

Hey, if my aversion to moisture in a fuel system is a throwback to steel tanks (which my '07 has) or is insignificant due to the alcohol in our petrol (alcohol attaches to water molecules and passes it with the petrol) then the joke's on me.
Agree - one of the first things I learned when started trucking in '84 was to always top off the tanks - exactly to stop condensation - as well as drain some fuel from each tanks into a gas container every now and then and check for water.
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Old Jun 13th, 2021, 21:10   #72
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Default Two days of very different mileage results

https://www.volvoforums.org.uk/showt...38#post2744938
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Old Jun 14th, 2021, 01:52   #73
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Agree - one of the first things I learned when started trucking in '84 was to always top off the tanks - exactly to stop condensation - as well as drain some fuel from each tanks into a gas container every now and then and check for water.
But hasnt that changed now that the tanks for cars are of a plastic type?
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Old Jun 14th, 2021, 09:54   #74
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I figure it's an american thing, I did some googling and all the forums I saw discussing it were US posters. more humid air? I dunno..

in literally all the cars I've ever had it's never been an issue, I asked my dad and he went 'huh? not that i've ever heard of' and he's had more different cars than I've had hot dinners

so.. yeah I dunno, must be to do with different climates. or the effect is so negligible it only really applies to very high mileage which older cars (and especially non volvo!) didnt tend to get to anyway
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Old Jun 14th, 2021, 10:10   #75
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I know our air does contain moisture obviously, before anyone says that..

I have to drain my air line compressor every now and then because we don't want the tank to rust.. and yes a little puddle does form underneath when you pull the plug out, but that's a fairly big tank, 100% air and literally ramming the most possible air in (by design of what it's supposed to do..)
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Old Jun 14th, 2021, 10:55   #76
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But hasnt that changed now that the tanks for cars are of a plastic type?
Indeed , condensation in the tank is never a problem with any volvo in UK ... The vent goes through a charcoal filter into the inlet manifold so effectively a sealed system .
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