right... an update!
Del (50 pence) made a good point on yesterday while we were at Three Holes...
Having fitted larger tyres, my car now records fewer miles on its odometer than it normally would.
It has probably become more accurate, but comparing MPG with vehicles with varying tyre sizes is kinda pointless because larger tyres will give you better top speed, worse acceleration and different speedometer/odometer readings!
So... I read somewhere that my car having the tyres it has, means my speedo reading is 6% off.
Therefore, with normal tyres, my speedo would tell me that I'm covering 6% more miles than I actually am.
So... to work out my MPG I either have to know what percentage everyone else is at, or just put the 6% back on and compare it to "standard". I think i'll do the latter.
Last tank I achieved, supposedly, 329.7 miles at 23.82mpg.
On a standard Disco, that would have read out as 350.7 miles thereby giving 25.32 mpg.
So... for comparison, I should add 1.5mpg to any figure I calculate.
I actually got 23.82 mpg, but because a standard Disco has smaller wheels, it would have worked out at 25.32 mpg.
Sounds even better!
I'll put my calculator away now...
P.S....and I know taking 6% off gives different results to adding 6% on. I assumed by putting on larger tyres, the 6% would have been taken off, so I took my number of miles, divided by 94 and multiplied by 100 (as opposed to dividing by 100 and multiplying by 106)! 