Could be several possibilities, one being the timing belt let go.
Hybrid cars wil get better mileage under highway driving conditions as is the case with most cars. Stop and go city driving uses a decrease in efficiencey in any vehicle type.
The gas mileage the hybrid Honda Accord will get on the highway is 45 mpg. The gas mileage in the city is 49 mpg and the combined gas mileage is 47 mpg.
The Camry hybrid gets an EPA estimated 31 city and 35 highway.The normal hybrid gets 22 city and 33 Highway. Obviously the hybrid makes the most sense for people who do most of their driving in the city.
It depends on what type of driving you do. Hybrid vehicles tend to get the best mileage while driving in city traffic. The increase in mileage in the city is due to the increased used of the electric motor. Most hybrids (the notable exception is the Chevy Volt) will not use their electric motors while cruising down the highway. If you tend to do more highway driving, you will likely get better gas mileage by driving a vehicle with a diesel engine. Modern diesel engines run very smoothly, reliably, and cleanly. They also have the advantage of being less complicated than a hybrid vehicle while getting comparable highway mileage. City mileage in a diesel vehicle will be better than a regular car but not quite as good as a hybrid.
The Honda Insight Hybrid and Civic Hybrid both get 40 mpg CIty according to the government. The Civic Hybrid gets 45 highway and the Insight Hybrid gets 43 highway.
"Yes, Honda does make a hybrid car. It is the CR-Z. The base price for the coup is about $20,000. The mileage you can get wth an automatic transmission is about 35 miles per gallon for city driving, and 39 mpg highway."
The EPA range estimate for the 2010 Toyota Camry-Hybrid is 567.6 mi. in the city, 584.8 mi. on the highway.
The EPA range estimate for the 2012 Hyundai Sonata-Hybrid is 584.8 mi. in the city, 670.8 mi. on the highway.
The EPA range estimate for the 2012 Toyota Highlander-Hybrid is 481.6 mi. in the city, 481.6 mi. on the highway.
The EPA range estimate for the 2008 Toyota Camry-Hybrid is 567.6 mi. in the city, 584.8 mi. on the highway.
The EPA range estimate for the 2011 GMC Yukon-Hybrid is 500 mi. in the city, 575 mi. on the highway.
The EPA range estimate for the 2011 Cadillac Escalade-Hybrid is 520.0 mi. in the city, 598.0 mi. on the highway.