okokok the engine depends on your likings. good thing mine is only 54.99 on a website i no. i love my ld3. ok for a good engine get ready to spend 75-100++ upto 250 and over for the nova's very very very very good engines but you dont need them. an hpi t-15 is good laso 1.4or.5 hp is good enough for 75 dollars. to put engines are well again depends on car. you can do it your self. but you must put everything back to where it came from. only thing you need to do is unscrew some bolts and put the other one on and replace the muffler. but dont mess with anything else like gears. you can slide it out if done correctly. then again you can rebuild your engine which is cheaper but i like to break -in a new engine. and rebuilds here in ny most hobby shops dont do it but a dvd on how to- on nitro engine shows you.replacing the piston, connecting rod, and sleeve is what a rebuild it and must me brokin in again. easy to me.

a tank of gas in my car driven regularly last about a good 15 minutes or driven hard 10. on a very full tank. a gallon of fuel should last you very long tho

sry for the low responce hope you think its helpful.