Hang on a second...
How much are you paying for fuel? The more traditional measurement
would be litres or gallons, not £'s
In some areas it's almost £1 a litre, which means £15 is buying you
3.2 Gallons, so you're getting almost 30mpg, which is quite possible
if your motorway miles are spent at 90mph.
As my maths teacher used to say... Please sure your working.
I suspect your more modern 320d might actually be better at 90mph that
a 318. The 318 will be working a lot harder, plus the 320d has a more
modern injection system than the old E36 318/325 td (I'm assuming he
has an E36, he hasn't come forth with any info!) which is only
slightly more advance than an old tractor! I can say this, I have a
'96 325 tds :o)
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