The main objectives of this study are (1) to investigate whether there are differencesin the behavior of private car owners in Saraburi Province in regard to the use ofalternative forms of energy to replace regular-grade gasoline (“petrol”), and (2) toinvestigate the main factors that impact the behavior of private car owners in SaraburiProvince with regard to the use of alternative forms of energy to replace regular-gradegasoline. The study hypothesizes that differences in gender, age, education level,occupation, and income levels of private car owners lead to differences in behaviorregarding the use of alternative forms of energy to replace regular-grade gasoline. Theresearcher studied trends, theories, and related research pertaining to alternative formsof energy, and this process led to the development of a questionnaire concerningbehavior pertaining to use of alternative forms of energy. The survey used a 5-pointrating scale and a pilot study was conducted with 100 respondents to test thequestionnair reliability by using a statistical tool to find the discrimination level foreach question. Stratified sampling was then conducted, along with simple randomsampling and quota sampling resulting in 400 responses from private car owners inSaraburi Province. The survey data were statistically analyzed to find the percentage,mean, and standard deviation; hypothesis testing was conducted using t-test andANOVA. The study found that private car owners who differ in gender, age andoccupation do not display behavioral differences in the use of alternative energy toreplace regular-grade gasoline. Private car owners who differ in educational andincome levels displayed behavioral differences in the use of alternative energy toreplace regular-grade gasoline. However, further study is required because the sampledata for this research was limited to respondents living in Saraburi Province.