Listed below are all documents and RMI.org site pages related to this topic.
5 Items
http://www.rmi.org/RFGraph-tractive_load_formulas
Powertrain efficiency from tank to wheels can't exceed 1.0, and is around 0.17 in a typical modern car or 0.35 in a good "full hybrid," but the energy needed to move the car can be reduced severalfold by making it lighter and more slippery.
http://www.rmi.org/RFGraph-efficiency_gain_low_rolling_resistance_tires
Losses due to rolling resistance are higher for heavier vehicles than for autos. In a Class 8 tractor trailer at 65 mph, 13% of fuel is lost to rolling resistance. Wide base single tires save about half of that today, more with next-generation tires.
http://www.rmi.org/RFGraph-Tire_price_and_rolling_resistance_coefficient
It costs little or no more to purchase tires with dramatically improved rolling resistance. Going from the least to most efficient tires improves fuel economy by over 8%.
http://www.rmi.org/RFGraph-Basic_characteristics_of_Revolutionary_plus_autos
Our Revolutionary auto class is based on RMI’s extensive work on the Hypercar. We use a cost model for superefficient battery-electric and fuel cell autos for both cars and light trucks. These vehicles, described in this table, are designed to compete with EIA’s average automobile in price and all driver attributes.
http://www.rmi.org/RFGraph-heavy_truck_efficiency
Better design can save up to 45% of U.S. heavy truck fuel, or 1.7 Mbbl/d in 2050, at a weighted-average cost equivalent to $1.00-per-gallon diesel fuel.