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p2roverman · 17th October 2018, 22:50

I recently had reason to rush home so over 80 miles of the M42 / A42 / M1 I averaged 72 mph with a petrol consumption of 42 mpg, according to the on board system. A few days later driving at my normal 65 mph I noticed the mpg figure actually go down from 40.2 to 39.7 mpg

This seems to defy logic, or is the engine known to be more economical at 3500 rpm than 2800 rpm?

My normal driving engine rev range is 1500 - 3000. Is this the best rev range for economicl driving, or should I keep the revs higher? I'm used to slower revving older Rover engines so would appreciate members' views.

17th October 2018, 22:50	#1
p2roverman Gets stuck in Rover 75 Connie Tourer & Connie SE Saloon & Club SE Tourer Join Date: Sep 2014 Location: Leeds Posts: 975 Thanks: 199 Thanked 71 Times in 59 Posts	KV6 fuel consumption I recently had reason to rush home so over 80 miles of the M42 / A42 / M1 I averaged 72 mph with a petrol consumption of 42 mpg, according to the on board system. A few days later driving at my normal 65 mph I noticed the mpg figure actually go down from 40.2 to 39.7 mpg This seems to defy logic, or is the engine known to be more economical at 3500 rpm than 2800 rpm? My normal driving engine rev range is 1500 - 3000. Is this the best rev range for economicl driving, or should I keep the revs higher? I'm used to slower revving older Rover engines so would appreciate members' views.