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Never used a speedo healer, but presumably they work. Here are some Gen 1 figures; they'll give you an idea of the effects of gearing changes, but you'll need to convert them to kmh:
....... 1st 2nd 3rd 4th 5th 6th
16/39 77 104 132 157 178 194
16/40 75 101 129 153 173 189
16/41 73 99 126 150 169 184
16/42 72 97 123 146 165 180
16/43 70 95 120 143 161 176
17/39 82 111 141 167 189 206
17/40 80 108 137 163 184 201
17/41 78 105 134 159 180 196
17/42 76 103 131 155 176 191
17/43 74 100 128 152 171 187
18/39 87 117 149 177 200 218
18/40 85 114 145 173 195 212
18/41 83 112 142 168 190 207
18/42 81 109 138 164 186 202
18/43 79 106 135 161 182 198
19/39 92 124 157 187 211 230
19/40 89 121 153 182 206 224
19/41 87 118 150 178 201 219
19/42 85 115 146 173 196 214
19/43 83 112 143 170 192 209
I don't think you'll get any significant fuel saving by playing with gearing for that speed.
....... 1st 2nd 3rd 4th 5th 6th
16/39 77 104 132 157 178 194
16/40 75 101 129 153 173 189
16/41 73 99 126 150 169 184
16/42 72 97 123 146 165 180
16/43 70 95 120 143 161 176
17/39 82 111 141 167 189 206
17/40 80 108 137 163 184 201
17/41 78 105 134 159 180 196
17/42 76 103 131 155 176 191
17/43 74 100 128 152 171 187
18/39 87 117 149 177 200 218
18/40 85 114 145 173 195 212
18/41 83 112 142 168 190 207
18/42 81 109 138 164 186 202
18/43 79 106 135 161 182 198
19/39 92 124 157 187 211 230
19/40 89 121 153 182 206 224
19/41 87 118 150 178 201 219
19/42 85 115 146 173 196 214
19/43 83 112 143 170 192 209
I don't think you'll get any significant fuel saving by playing with gearing for that speed.
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