operating expenses millions 2012 2011 2010 % (  % ) change 2012 v 2011 % (  % ) change 2011 v 2010 .

2012: compensation and benefits: 4685
fuel: 3608
purchased services and materials: 2143
depreciation: 1760
equipment and other rents: 1197
other: 788
total: 14181
2011: compensation and benefits: 4681
fuel: 3581
purchased services and materials: 2005
depreciation: 1617
equipment and other rents: 1167
other: 782
total: 13833
2010: compensation and benefits: 4314
fuel: 2486
purchased services and materials: 1836
depreciation: 1487
equipment and other rents: 1142
other: 719
total: 11984
% (  % ) change 2012 v 2011: compensation and benefits: -% ( - % )
fuel: 1
purchased services and materials: 7
depreciation: 9
equipment and other rents: 3
other: 1
total: -3
% (  % ) change 2011 v 2010: compensation and benefits: -9
fuel: 44
purchased services and materials: 9
depreciation: 9
equipment and other rents: 2
other: 9
total: -15

operating expenses increased $ 348 million in 2012 versus 2011 . depreciation , wage and benefit inflation , higher fuel prices and volume- related trucking services purchased by our logistics subsidiaries , contributed to higher expenses during the year . efficiency gains , volume related fuel savings ( 2% ( 2 % ) fewer gallons of fuel consumed ) and $ 38 million of weather related expenses in 2011 , which favorably affects the comparison , partially offset the cost increase . operating expenses increased $ 1.8 billion in 2011 versus 2010 . our fuel price per gallon rose 36% ( 36 % ) during 2011 , accounting for $ 922 million of the increase . wage and benefit inflation , volume-related costs , depreciation , and property taxes also contributed to higher expenses . expenses increased $ 20 million for costs related to the flooding in the midwest and $ 18 million due to the impact of severe heat and drought in the south , primarily texas . cost savings from productivity improvements and better resource utilization partially offset these increases . a $ 45 million one-time payment relating to a transaction with csx intermodal , inc ( csxi ) increased operating expenses during the first quarter of 2010 , which favorably affects the comparison of operating expenses in 2011 to those in 2010 . compensation and benefits 2013 compensation and benefits include wages , payroll taxes , health and welfare costs , pension costs , other postretirement benefits , and incentive costs . expenses in 2012 were essentially flat versus 2011 as operational improvements and cost reductions offset general wage and benefit inflation and higher pension and other postretirement benefits . in addition , weather related costs increased these expenses in 2011 . a combination of general wage and benefit inflation , volume-related expenses , higher training costs associated with new hires , additional crew costs due to speed restrictions caused by the midwest flooding and heat and drought in the south , and higher pension expense drove the increase during 2011 compared to 2010 . fuel 2013 fuel includes locomotive fuel and gasoline for highway and non-highway vehicles and heavy equipment . higher locomotive diesel fuel prices , which averaged $ 3.22 per gallon ( including taxes and transportation costs ) in 2012 , compared to $ 3.12 in 2011 , increased expenses by $ 105 million . volume , as measured by gross ton-miles , decreased 2% ( 2 % ) in 2012 versus 2011 , driving expense down . the fuel consumption rate was flat year-over-year . higher locomotive diesel fuel prices , which averaged $ 3.12 ( including taxes and transportation costs ) in 2011 , compared to $ 2.29 per gallon in 2010 , increased expenses by $ 922 million . in addition , higher gasoline prices for highway and non-highway vehicles also increased year-over-year . volume , as measured by gross ton-miles , increased 5% ( 5 % ) in 2011 versus 2010 , driving expense up by $ 122 million . purchased services and materials 2013 expense for purchased services and materials includes the costs of services purchased from outside contractors and other service providers ( including equipment 2012 operating expenses .

Questions:
what was the per-gallon cost of locomotive diesel fuel prices in 2012?
and in 2011?
so what was the difference between these years?
using this value, what was the estimated fuel cost for 2012?
and converted to the billions?

Answers:
3.22
3.12
0.10
1050
1050000000