Surprise mpg for petrol E320

forrester123

Active Member
Joined
Mar 16, 2015
Messages
70
Location
Cinderford
Car
E 320
Just got back from my hols. in Czech Republic, where I did about 2k.
On the autobahn, I cruised at 90/100 mph where possible & the computer showed around 32 mpg, which was good.
I found the most economical cruising speed was 80/85 mph where it showed 34mpg.
Cruising around 70 only showed 30mpg on average.
How accurate is the computer mpg?
[The car is an 03 with 66k ]
 

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