Depends what you are doing and where. Remember it only weighs the full amount when you fill it. When I was running a 3.5 tonner on field service work in Scotland and N. England I would often use a tank full in a day, who wants to fill up more often than you have to? The extra break time thing doesn't work either, most of the time is taken getting to and from the station, getting in and out, queueing on the forecourt and in the shop, not actually filling up so if you have to do it twice instead of once you are losing way more time than you gain by short filling.

It's all good for me Peter 😂on the security side of things the fuel bandits very seldom go around by themselves there are normally 2 or more and there all probably packing so yes I would not lock my tank for minimum damage or get out of the vehicle I would try to drive off however as long as it was safe to do so 😜

I never fill the Merc up because it pisses out all over the place due to the bad seals.

To me you start the day and fill it . Simply put i dont need the hassle and stress of worrying about when to get fuel . Also leaves a tank empty over night for when the thieves come out to play . Diesel weighs in at around 20% less than a kilo . 100L comes in at just over 80 kilos .

van in for a major service, given a loaner. Had a job booked in so filled the tank just enough to cover the journey. Job gets cancelled at collection. Darwin award goes to.........

I like to fill my tank when it gets to half empty, Just because I've been caught out with pumps not having fuel and nearly empty,

They stopped doing the £1 check years ago. Now they charge about £125 at tesco.

the take £100 upfront now at pay at pumps

I also just fill up half a tank at a time. One reason is to save a little weight but also having a fuel card where I get my price for the next week it can sometimes work out cheaper. At the moment my price has gone up. So I'm back to using supermarket fuel as it's a little cheaper