True gas rc cars are powered by gasoline, but nitro cars are often referred to as 'gas powered' which can lead to some confusion for those who are new to the hobby.
Gasoline radio control models aren't as popular as nitro or electric but they are becoming more widely available.
The primary difference with gas cars is the size; because the motors used are commonly based on the 2-stroke gasoline motors that are found in the 'weedeater' garden tools (such as strimmers, edgers and blowers), then everything else has to be 'scaled up' to fit!
For example, the HARM gas rc cars vary around the 30 inches long mark, which puts them into the large 1:5 scale category - that's big!

The HARM range of cars come RTR and there is a choice of bodies - some modeled from real cars and other non-scale ones.
With a 23cc motor, these cars have plenty of power to push them along and a good size gasoline tank gives a run time of around 40 minutes, which is a lot of driving!
Admittedly, these gas rc cars are more expensive than their nitro powered cousins and because of this they're probably not the kind of model you'd buy for a first time radio control car!
Shown below are a couple of examples of models from the HARM 1:5 large scale range, the Mercedes DTM CLK and the Cross Buggy:

Gas rc cars such as these are easy to maintain, more so than nitro cars in many cases. The 2 stroke engine is easy to work on and everything is very accessible because of the large size.
Despite the higher purchase price, the running costs of gas cars are substantially lower than nitro models because the price of gasoline is much cheaper per volume measure than nitro methane fuel.
Furthermore, these large scale gas cars are very impressive to watch!
The Duratrex Firehammer is available from RC Discounts.
Buy the 5th Scale iFMAR World Championships DVD.
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