diff --git a/src/graph_gui.cpp b/src/graph_gui.cpp
index 59f8d40088..05430dddad 100644
--- a/src/graph_gui.cpp
+++ b/src/graph_gui.cpp
@@ -1048,10 +1048,13 @@ struct PaymentRatesGraphWindow : BaseGraphWindow {
 
 		int i = 0;
 		const CargoSpec *cs;
+		const float factor = 200.0f * 28.57f * 0.4f;
+
 		FOR_ALL_SORTED_STANDARD_CARGOSPECS(cs) {
 			this->colours[i] = cs->legend_colour;
-			for (uint j = 0; j != 20; j++) {
-				this->cost[i][j] = GetTransportedGoodsIncome(10, 20, j * 4 + 4, cs->Index());
+			for (int j = 0; j != 20; j++) {
+				const byte ctt = static_cast<byte>(factor / ((static_cast<float>(j) + 1) * 10.0f));
+				this->cost[i][j] = GetTransportedGoodsIncome(1, 200, ctt, cs->Index());
 			}
 			i++;
 		}
diff --git a/src/lang/english.txt b/src/lang/english.txt
index 80eae3b445..22f3e8d7ce 100644
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -598,7 +598,7 @@ STR_GRAPH_COMPANY_PERFORMANCE_RATINGS_CAPTION                   :{WHITE}Company
 STR_GRAPH_COMPANY_VALUES_CAPTION                                :{WHITE}Company values
 
 STR_GRAPH_CARGO_PAYMENT_RATES_CAPTION                           :{WHITE}Cargo Payment Rates
-STR_GRAPH_CARGO_PAYMENT_RATES_X_LABEL                           :{TINY_FONT}{BLACK}Days in transit
+STR_GRAPH_CARGO_PAYMENT_RATES_X_LABEL                           :{TINY_FONT}{BLACK}Average transit speed (km/h)
 STR_GRAPH_CARGO_PAYMENT_RATES_TITLE                             :{TINY_FONT}{BLACK}Payment for delivering 10 units (or 10,000 litres) of cargo a distance of 20 squares
 STR_GRAPH_CARGO_ENABLE_ALL                                      :{TINY_FONT}{BLACK}Enable all
 STR_GRAPH_CARGO_DISABLE_ALL                                     :{TINY_FONT}{BLACK}Disable all