| United States | | | | | | | | California |
| Year | Vehicle Miles Taveled (VMT) | Population | GDP (Billions of 2009 dollas) | Gas Price (2011 Dollars) | GDP per capita | VMT per capita | | Year | Unemployment Rate | Interest Rate on New Vehicles | Number of Passenger Cars | Number of Light Duty Trucks | Total number of vehicles | Population | VMT (millions) | VMT per capita |
| 1966 | 927,899 | 125,697,033 | $ 4,235 | $ 1.73 | | | | 1966 | 3.8 | 7.23 | 8,693,303 | 1,638,920 | | 18,789,242 | 100,958 |
| 1967 | 966,005 | 127,576,707 | $ 4,351 | $ 1.72 | | | | 1967 | 3.9 | 7.62 | 9,088,947 | 1,740,729 | | 19,095,782 | 103,818 |
| 1968 | 1,019,726 | 129,594,374 | $ 4,565 | $ 1.71 | | | | 1968 | 3.7 | 8.305 | 9,314,496 | 1,788,714 | | 19,302,322 | 106,070 |
| 1969 | 1,066,108 | 131,797,049 | $ 4,708 | $ 1.65 | | | | 1969 | 3.5 | 9.175 | 9,686,302 | 1,894,444 | | 19,607,863 | 111,744 |
| 1970 | 1,114,098 | 133,595,295 | $ 4,718 | $ 1.62 | | | | 1970 | 4.9 | 10.21 | 9,883,790 | 1,996,334 | | 20,023,181 | 116,992 |
| 1971 | 1,183,524 | 136,954,829 | $ 4,873 | $ 1.58 | | | | 1971 | 5.9 | 10.695 | 10,234,172 | 2,111,817 | | 20,364,238 | 118,023 |
| 1972 | 1,264,614 | 139,735,203 | $ 5,129 | $ 1.55 | | | | 1972 | 5.7 | 10.975 | 10,560,142 | 2,270,630 | | 20,622,120 | 126,488 |
| 1973 | 1,316,207 | 142,398,950 | $ 5,418 | $ 1.45 | | | | 1973 | 4.9 | 11.145 | 10,910,604 | 2,479,152 | | 20,923,727 | 129,849 |
| 1974 | 1,282,790 | 145,093,729 | $ 5,390 | $ 1.43 | | | | 1974 | 5.4 | 11.79 | 11,162,119 | 2,498,811 | | 21,247,201 | 127,600 |
| 1975 | 1,330,074 | 147,970,069 | $ 5,380 | $ 1.80 | | | | 1975 | 8.8 | 12.24 | 11,226,325 | 2,643,397 | | 21,630,031 | 132,600 |
| 1976 | 1,409,163 | 150,917,244 | $ 5,669 | $ 1.81 | | | | 1976 | 7.6 | 12.12 | 11,478,776 | 2,814,744 | | 22,046,484 | 139,700 |
| 1977 | 1,476,567 | 153,837,969 | $ 5,931 | $ 1.77 | | | | 1977 | 7.2 | 12.03 | 11,694,053 | 3,241,523 | | 22,480,890 | 150,300 |
| 1978 | 1,548,213 | 156,795,149 | $ 6,260 | $ 1.74 | | | | 1978 | 5.9 | 12.085 | 11,974,736 | 3,468,092 | | 22,988,266 | 162,389 |
| 1979 | 1,529,133 | 159,869,630 | $ 6,459 | $ 1.62 | | | | 1979 | 5.7 | 12.765 | 12,466,173 | 3,771,658 | | 23,423,038 | 159,746 |
| 1980 | 1,527,295 | 162,789,000 | $ 6,443 | $ 2.03 | | | | 1980 | 7.6 | 14.56 | 13,268,006 | 3,580,834 | | 23,800,800 | 155,890 |
| 1981 | 1,555,308 | 166,218,463 | $ 6,611 | $ 2.58 | | | | 1981 | 7.5 | 16.355 | 13,208,593 | 3,557,517 | | 24,299,875 | 159,900 |
| 1982 | 1,595,010 | 168,784,927 | $ 6,484 | $ 2.68 | | | | 1982 | 9.6 | 16.49 | 13,420,945 | 3,675,347 | | 24,847,891 | 169,999 |
| 1983 | 1,652,788 | 171,118,390 | $ 6,785 | $ 2.40 | | | | 1983 | 10.1 | 13.25 | 13,935,390 | 3,797,926 | | 25,401,849 | 182,652 |
| 1984 | 1,720,269 | 173,201,853 | $ 7,277 | $ 2.19 | | | | 1984 | 7.2 | 14.165 | 14,095,912 | 3,835,287 | | 25,900,165 | 196,537 |
| 1985 | 1,774,826 | 175,124,316 | $ 7,586 | $ 2.08 | | | | 1985 | 7.4 | 12.445 | 13,968,518 | 4,896,268 | | 26,510,817 | 207,600 |
| 1986 | 1,834,872 | 177,052,780 | $ 7,852 | $ 2.01 | | | | 1986 | 7.2 | 10.385 | 14,415,379 | 5,309,069 | | 27,185,890 | 214,913 |
| 1987 | 1,921,204 | 178,986,243 | $ 8,124 | $ 1.50 | | | | 1987 | 6.2 | 10.59 | 14,629,229 | 5,627,769 | | 27,874,754 | 226,301 |
| 1988 | 2,025,962 | 180,973,706 | $ 8,465 | $ 1.52 | | | | 1988 | 5.4 | 11.73 | 15,224,990 | 6,074,441 | | 28,575,786 | 241,575 |
| 1989 | 2,096,487 | 183,037,169 | $ 8,777 | $ 1.46 | | | | 1989 | 5.3 | 12.345 | 15,338,606 | 6,243,373 | | 29,343,644 | 251,482 |
| 1990 | 2,144,362 | 185,286,966 | $ 8,945 | $ 1.57 | | | | 1990 | 5.2 | 12.16 | 15,364,023 | 6,521,728 | | 29,959,515 | 258,926 |
| 1991 | 2,172,050 | 187,589,654 | $ 8,939 | $ 1.73 | | | | 1991 | 6.9 | 11.775 | 15,017,681 | 7,194,679 | | 30,482,523 | 257,976 |
| 1992 | 2,247,151 | 189,987,074 | $ 9,257 | $ 1.67 | | | | 1992 | 7.8 | 9.61 | 14,545,660 | 7,615,805 | | 30,998,233 | 262,548 |
| 1993 | 2,296,378 | 192,379,730 | $ 9,511 | $ 1.60 | | | | 1993 | 7.0 | 8.785 | 14,691,068 | 8,091,221 | | 31,310,290 | 266,408 |
| 1994 | 2,357,588 | 194,611,985 | $ 9,895 | $ 1.58 | | | | 1994 | 6.1 | 8.955 | 14,504,566 | 7,792,048 | | 31,531,584 | 271,943 |
| 1995 | 2,422,823 | 196,985,922 | $ 10,164 | $ 1.59 | | | | 1995 | 5.6 | 10.38 | 14,297,486 | 8,091,364 | | 31,755,518 | 276,371 |
| 1996 | 2,482,202 | 199,405,561 | $ 10,550 | $ 1.68 | | | | 1996 | 5.3 | 9.445 | 15,398,720 | 9,771,261 | | 32,089,557 | 278,043 |
| 1997 | 2,552,233 | 202,011,889 | $ 11,023 | $ 1.65 | | | | 1997 | 5.0 | 8.075 | 15,705,806 | 9,194,701 | | 32,568,521 | 279,096 |
| 1998 | 2,628,148 | 204,723,819 | $ 11,513 | $ 1.40 | | | | 1998 | 4.5 | 7.515 | 16,174,220 | 9,380,604 | | 33,081,973 | 290,630 |
| 1999 | 2,690,241 | 207,418,583 | $ 12,071 | $ 1.52 | | | | 1999 | 4.3 | 7.55 | 16,657,441 | 9,658,010 | | 33,605,289 | 300,066 |
| 2000 | 2,746,925 | 209,877,652 | $ 12,565 | $ 1.93 | | | | 2000 | 4.0 | 7.975 | 17,321,413 | 10,329,198 | | 34,010,375 | 306,649 |
| 2001 | 2,781,462 | 212,660,928 | $ 12,684 | $ 1.83 | | | | 2001 | 4.5 | 7.07 | 17,918,760 | 10,812,255 | | 34,596,900 | 310,703 |
| 2002 | 2,855,756 | 215,013,936 | $ 12,910 | $ 1.67 | | | | 2002 | 5.8 | 5.955 | 18,449,629 | 11,118,654 | | 34,980,962 | 320,942 |
| 2003 | 2,890,893 | 217,623,683 | $ 13,270 | $ 1.92 | | | | 2003 | 6.3 | 5.165 | 18,699,434 | 11,496,248 | | 35,445,913 | 323,592 |
| 2004 | 2,962,513 | 220,246,939 | $ 13,774 | $ 2.20 | | | | 2004 | 5.6 | 5.48 | 19,255,690 | 12,090,263 | | 35,827,786 | 328,917 |
| 2005 | 2,989,807 | 222,738,806 | $ 14,236 | $ 2.60 | | | | 2005 | 5.0 | 6.545 | 19,638,969 | 12,793,485 | | 36,114,333 | 329,267 |
| 2006 | 3,014,116 | 225,420,985 | $ 14,615 | $ 2.84 | | | | 2006 | 4.6 | 6.355 | 19,835,554 | 13,289,690 | | 36,436,172 | 327,478 |
| 2007 | 3,029,822 | 227,472,684 | $ 14,877 | $ 2.99 | | | | 2007 | 4.6 | 6.32 | 20,037,727 | 13,839,571 | | 36,352,594 | 328,312 |
| 2008 | 2,973,509 | 229,795,293 | $ 14,834 | $ 3.41 | | | | 2008 | 5.6 | 6.27 | 19,919,068 | 13,504,551 | | 36,728,163 | 327,286 |
| 2009 | 2,977,591 | 232,095,429 | $ 14,418 | $ 2.43 | | | | 2009 | 9.5 | 5.27 | 19,972,837 | 14,400,834 | | 36,929,598 | 324,486 |
| | Correlation between | Your Guess | | Corelation | Tstat | Significant | | | Correlation between | Your Guess | | Corelation | Tstat | Significant |
| | | Direction | Strength | Coefficient (r) | | at 95% level? | | | | Direction | Strength | Coefficient (r) | | at 95% level? |
| | VMT and Population | | | | | | | | Interest rate and number of vehicles |
| | VMT and GDP | | | | | | | | VMT per capita and unemployment rate |
| | VMT per capita and GDP per capita | | | | | | | | Number of vehicles and VMT |
| | Gas price and VMT per capita | | | | | | | | Unemployment rate and population |