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Many small engines go out of optimal range in highway speeds.
Worst ever experience is diesel 1.5 dci 18 mpg of Renault kangoo running on 3400 rpm at 80 mph.
Peugeot 107 (with city optimized Toyota KR1-FE 1.0 gasoline) does 31-33 mpg at 75mph. That is 134-125 mpg / seat. Compared to Renault Grand Espace 3 which will go 181 mpg / seat at 80 mph.
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