G
Guest
Guest
Ladies and Gents
Last January I had to replace two tyres and since Dunlop no longer make
all terrain "Grand Treks" I swapped to BFG all terrains on the rear
axle. They have a much chunkier treat pattern than the Dunlops, and this
was the week before the heavy snow where they definitely helped, so no
complaints there.
However I have noticed that the truck's fuel economy has dropped by
about 1 or 2 mpg (ie perhaps 5%, it's hard to be more precise) over the
last few months, and from what I've read this is not wholly unexpected
when fitting tyres with a chunkier tread. I have noticed that there is
a slight warm rubber smell from the BFGs after longer journeys, which
sort of confirms this.
As far as I can tell it's going OK, the engine sounds fine, oil
consumption is negligible and it only smokes a bit under full throttle
acceleration when on full boost @ 2000rpm or higher (as it always has
done). It has done 153k miles and is on the original and unserviced
fuel pump & injectors.
Would the consensus of the forum expect this sort of mpg loss from
chunkier tyres, or should I look harder for other problems?
Also should I get excited about the fact that the BFGs on the rear
(nearly new) are about 1cm greater diameter than the Dunlops on the
front (25k+ miles)? I know one is supposed to rotate tyres regularly
to keep wear even, but I can't help feeling that the centre diff and
viscous coupling should handle that sort of minor difference without
trouble. Or could the difference in rolling radii, causing front/rear
fighting in the transmission, perhaps contribute to the loss of fuel
economy?
Christopher Bell
Devon, UK
1996 1HD-FT
____________________________________________________________
Electronic mail messages entering and leaving Arup business
systems are scanned for acceptability of content and viruses
--
European Land Cruiser Owners Mailing List
Further Info: http://www.landcruisers.info/
Last January I had to replace two tyres and since Dunlop no longer make
all terrain "Grand Treks" I swapped to BFG all terrains on the rear
axle. They have a much chunkier treat pattern than the Dunlops, and this
was the week before the heavy snow where they definitely helped, so no
complaints there.
However I have noticed that the truck's fuel economy has dropped by
about 1 or 2 mpg (ie perhaps 5%, it's hard to be more precise) over the
last few months, and from what I've read this is not wholly unexpected
when fitting tyres with a chunkier tread. I have noticed that there is
a slight warm rubber smell from the BFGs after longer journeys, which
sort of confirms this.
As far as I can tell it's going OK, the engine sounds fine, oil
consumption is negligible and it only smokes a bit under full throttle
acceleration when on full boost @ 2000rpm or higher (as it always has
done). It has done 153k miles and is on the original and unserviced
fuel pump & injectors.
Would the consensus of the forum expect this sort of mpg loss from
chunkier tyres, or should I look harder for other problems?
Also should I get excited about the fact that the BFGs on the rear
(nearly new) are about 1cm greater diameter than the Dunlops on the
front (25k+ miles)? I know one is supposed to rotate tyres regularly
to keep wear even, but I can't help feeling that the centre diff and
viscous coupling should handle that sort of minor difference without
trouble. Or could the difference in rolling radii, causing front/rear
fighting in the transmission, perhaps contribute to the loss of fuel
economy?
Christopher Bell
Devon, UK
1996 1HD-FT
____________________________________________________________
Electronic mail messages entering and leaving Arup business
systems are scanned for acceptability of content and viruses
--
European Land Cruiser Owners Mailing List
Further Info: http://www.landcruisers.info/