OK. here's an ouch. Tonight on our local news, they said Aspen,Colorado has hit the $4.00/gallon mark for regular unleaded.. By the end of the summer they(Aspen city officials) are conceding that gas will be $6.00/gallon. Diesel here in Denver is costing around $3.05-3.15/gallon. Thank goodness we have a diesel car, 30mpg city, 40 hwy.