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I fitted a higher ratio Diff at one time and expected better mpg but it went down if anything.
Steve
Hi Steve,
It should make a difference on a run, but town driving means more revs when starting off, hence more fuel. I found this from experience with my old MOD Stag. +/- 18-20mpg around town, 30mpg on a run. So it depends on what you use the Stag for.
Dave
Dave
1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.
I`vegone from 185/80 14"(standard profile) =lots of tyre wall roll to 195/70 14"=higher gearing=slightly less roll=better mpg on the open road BUT you have to have enough power to allow the engine to pull the higher gearing. Now I`ve gone to 195/65 15" which is the same rolling radius as the 185/70.
Result MUCH better handling and a much bigger spread of tyre makes to choose from.
Forgot to say I feel that 195 width is the biggestI would want to fit on a Stag. Biggest is NOT alwaysbest in this case as you may get `tramlining` with 205`s and bad wet weather adhesion
Just for interest I am running on 205/60 x14 on original wheels and I do not get any tramlining. They give great grip but are a fraction smaller in diameter
Im running 195/60/15s on mine much improved handling and speedo is now correct after being incorrect on standard alloys after conversion from auto to manual.
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